Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e73a45cf8bda890…

MALICIOUS

PDF

78.0 KB Created: 2021-03-10 06:50:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 34bd58bd641db1fa878260c8b18c1892 SHA-1: 84c6363283468849cfce05bff65475119291bf50 SHA-256: 6e73a45cf8bda890aba33019721b7420ccc02ca12db2937db8f8bfce4a06127e
186 Risk Score

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/aws?utm_term=how+to+get+computer+programming+certification PDF link annotation
    • https://cdn.sqhk.co/fuxuduxexi/dosuhi0/balling_on_a_budget.pdfIn PDF document text
    • https://wixotavu.weebly.com/uploads/1/3/4/7/134764887/melexivopajukeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418970/normal_6017268723b2b.pdfIn PDF document text
    • https://bomuwokobija.weebly.com/uploads/1/3/4/0/134041081/7207042.pdfIn PDF document text
    • https://cdn.sqhk.co/guvevifowo/PhizBja/oceanhorn_walkthrough_sky_island.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373016/normal_60255e5cd1d1e.pdfIn PDF document text
    • https://cdn.sqhk.co/takejirasomu/jjgcAdP/28200578767.pdfIn PDF document text
    • https://nabozuritofawun.weebly.com/uploads/1/3/1/8/131857241/detuzubelutulafab.pdfIn PDF document text
    • https://cdn.sqhk.co/desiketomasu/ngfFia0/nunagazu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424662/normal_5ff69d0bdf5e6.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/ii9ii4l/18104603190.pdfIn PDF document text
    • https://cdn.sqhk.co/libobivole/Ia4jjgC/74449738251.pdfIn PDF document text
    • https://sukaxivex.weebly.com/uploads/1/3/4/8/134895869/7601670.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3437305d-a3f4-4f94-9a63-846dd410f5be.filesusr.com/ugd/ffe76b_230eef06584246bc823cf851a101b56f.pdf?index=trueIn PDF document text
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_ff516b99a0a040b189d176b46f70d52c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b00b808-52f2-4e1f-8d17-d99a0778d7df/why_is_information_literacy_important_in_society.pdfIn PDF document text
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_14cbd65b0a9e460a8bd7b42b13d3d391.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/25f54a95-39f0-4713-8e9d-bf1981e5de6f/oster_6_cup_rice_and_grain_cooker_with_steamer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18682ed0-d461-407b-9641-1f00ab025bd6/gokilez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a067465a-0c74-4eb2-a560-5c4da8681ddf/dell_inspiron_2350_drivers.pdfIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_69dd09261530402097305a8ca9ea791b.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_off0000f469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF469 5180 bytes
SHA-256: 1a82d41ac16f83865cb5e9f1ce07fd14560c3b2f4f9d46c77728caef85f7f6a3
font_01_sfnt_off00010610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10610 10640 bytes
SHA-256: 2189ad8428f99f9c415da2143c212c452edd94ca58bfb34be736ef22dff7d933