Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d8b0b26369fe6f…

MALICIOUS

PDF

92.4 KB Created: 2021-03-27 16:40:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2c48c3f55209cf1131b5a19d35bc7ec4 SHA-1: b7d5a82889ae238014e2195c31cefabb10ddf413 SHA-256: 20d8b0b26369fe6fc294598b955875f74fa792ae1b58fd37f086d8fe1547c3f5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to disposable hosting, indicative of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious content, possibly for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://resalured.ru/award?keyword=april+2020+current+affairs+pdf+adda247 PDF link annotation
    • http://gajelifuluxapov.mywebcommunity.org/food_chain_worksheet_3rd_grade.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/gbNAPmX/fashion_story_cracked_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/kezagajasiw/cibhiib/sojumawefekejusuz.pdfIn PDF document text
    • http://pivolirarorip.mypressonline.com/biorad_t100_thermal_cycler.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/cOhf8Yd/dizebelajilukinibixu.pdfIn PDF document text
    • http://fukerijinexin.mygamesonline.org/bamijepowiveteminulomo.pdfIn PDF document text
    • http://mawosatejojeka.sportsontheweb.net/xodenuxagibozibanu.pdfIn PDF document text
    • https://cdn.sqhk.co/mapetidul/Vgjsgfg/jerelirusowevaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://e028ba52-6c86-493e-86b7-fecf7cd1c3eb.filesusr.com/ugd/bcb9fd_22396f8baa564810854658e7a8bccef1.pdf?index=trueIn PDF document text
    • https://76bf42c0-7447-45ed-8dd3-33f9786ae3ae.filesusr.com/ugd/ba2c19_89dcac5554d54a4cb17f75d04685f550.pdf?index=trueIn PDF document text
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_1d96177d8c5742d2b6f15ae43e0221f0.pdf?index=trueIn PDF document text
    • https://edb7bb8d-792a-4213-93ec-7f573d37cc74.filesusr.com/ugd/bfd504_8cab7284da77408a97123222351edc5a.pdf?index=trueIn PDF document text
    • https://793776f3-68b4-44d3-947a-596ce2c6f652.filesusr.com/ugd/4e977a_7942dc158bc9478d8b659e940d41bbbd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed16a72b-2aea-4984-bda5-5bf3f6b59972/lubefas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3c2fad2-b189-482e-b976-25a79a2f5ac4/29879361280.pdfIn PDF document text
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_2d3fa1e53c6a473897681c67910f4d26.pdf?index=trueIn PDF document text
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_150b8dd2f83742109afdc9bb6641ca51.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/51a6a593-3049-4d3c-ab42-9fd63eb1a772/62038746874.pdfIn PDF document text
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_4bdecfda8e864284a733296d11c971f7.pdf?index=trueIn PDF document text
    • http://fuvuvadut.onlinewebshop.net/football_classes_for_10_year_olds_near_me.pdfIn PDF document text
    • https://f1c0478e-57b3-422a-b8eb-433964b677d2.filesusr.com/ugd/16c17d_7ea062b29cd44936b4a4b79d82a9b791.pdf?index=trueIn PDF document text
    • https://1dda4824-043e-406b-9213-03d4b91bb4d1.filesusr.com/ugd/7695bb_6f2fa83bd972457fb9b3b19486b354be.pdf?index=trueIn PDF document text
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_f937758a143e4c1d88db061f923464e2.pdf?index=trueIn PDF document text
    • https://74f55dc1-c9a5-4be3-8cb6-5a41d2e6c5ca.filesusr.com/ugd/bacb18_d30fdd42b40a4bbda6c505e70e0d81b0.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FD 5580 bytes
SHA-256: 5cfb85e85a5fe84de4518a577b581b2a5824eb020e0e7e980160011422142089
font_01_sfnt_off00010a12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A12 3720 bytes
SHA-256: 40ef96da86b6123d577d475be460de15c41b9ca7393a8e650be4e9942aa3c64b
font_02_sfnt_off00011574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11574 11112 bytes
SHA-256: d37a753dd4d0cde29faa0982700e9148c6cd50841662aba0d7c1789eaf978d98
font_03_sfnt_off00013abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ABB 13568 bytes
SHA-256: f7fc23ce8ff3f492b35f3c07351261fba24decbbf0f3a526f44bf90899c2a8bf

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