Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e88c4b4d10e865a…

MALICIOUS

PDF

71.7 KB Created: 2021-04-14 14:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 451a141bea577058db72b1d15a9dffa1 SHA-1: 93a6163a5ae667553643d12136581d627ab3d9ea SHA-256: 6e88c4b4d10e865a1ee4d08e15848af71dfc3f0212f882a61de920e91c1af04d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/strik?utm_term=tom+sawyer+diner PDF link annotation
    • https://tibefuwejar.weebly.com/uploads/1/3/4/3/134332688/bisenevu.pdfIn PDF document text
    • http://mevixonur.mywebcommunity.org/29021246506.pdfIn PDF document text
    • http://kifopelidito.mypressonline.com/speaking_part_2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479439/normal_600d095fc01a0.pdfIn PDF document text
    • https://potepivogatofef.weebly.com/uploads/1/3/2/7/132740463/51b90b374.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402519/normal_606049a39a22d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505363/normal_5fe163fdd9d4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392659/normal_5fd64bd680a1b.pdfIn PDF document text
    • http://retamos.mygamesonline.org/pdf_alternator_manual.pdfIn PDF document text
    • http://supariwepexafat.mywebcommunity.org/kubapipun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380854/normal_5fdc103891cc1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/14d9b4c3-084f-4930-bb1e-6678323b40d2/sapiniv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aef5b519-1411-4756-8567-55e7e52a92a1/80027740097.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27c08346-3e59-485a-ba42-1fa120dd956a/7242002365.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62f02b82-b5f5-4b3f-823b-d7f744122d77/kayla_itsines_bbg_2.0_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b69c4152-8680-4de4-a28a-639144e23154/67426218283.pdfIn PDF document text
    • https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_fe3d087161aa47c3aa598f9564b59d18.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea5b2d28-5c48-4820-8e0d-84b965bba758/define_self-reliance_and_give_example.pdfIn PDF document text
    • https://a0d2adcf-75bd-42a9-a42a-c23e1c6e9e1a.filesusr.com/ugd/85c99c_6fc255e8745c45849242fd1cfb7b612c.pdf?index=trueIn PDF document text
    • http://mijovutotukedes.onlinewebshop.net/xaluge.pdfIn PDF document text
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_e9b45b8366a3451d817dea97d6c1cb7d.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD4 5080 bytes
SHA-256: fa04606b6abfb1344a1df1a5e3e3671e9e0c8065c87e2dc9b12c0d517fa4891d
font_01_sfnt_off0000ec16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC16 11516 bytes
SHA-256: 8c86c6d892878d801eb48c8f0de7a6ede2ee01d99bc058be5a7067985f1c7343

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