Malicious PDF — malware analysis report

Static analysis result for SHA-256 5379af57717a0dc1…

MALICIOUS

PDF

74.9 KB Created: 2021-01-15 13:01:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 56bdb2d4ba53f3d90730c538bbc88bab SHA-1: 773b316a27e13fdd131b6d09c2975895838e167f SHA-256: 5379af57717a0dc1079c7c82bba0c2e03688287a30b57c24e189935c0c79f1ff
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 0.9998

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://traffking.ru/123?utm_term=mega+man+3+all+passwords PDF link annotation
    • https://laxuruvu.weebly.com/uploads/1/3/1/4/131482832/remukuj-fafirivatovudam-pimoke-lirenamubuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465144/normal_5fe5bdc3bf1fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383922/normal_5f982d93daf7a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419211/normal_600049dc93457.pdfIn PDF document text
    • https://zanixikowupu.weebly.com/uploads/1/3/1/4/131437740/2157332.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383574/normal_5f8c0fc16fe01.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389794/normal_5fd09136b3f2c.pdfIn PDF document text
    • https://site-1171953.mozfiles.com/files/1171953/vewesulo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365655/normal_5f871726b75bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403143/normal_5fbb79a28d49f.pdfIn PDF document text
    • https://site-1178201.mozfiles.com/files/1178201/green_bay_packers_chicago_bears_predictions.pdfIn PDF document text
    • https://site-1172650.mozfiles.com/files/1172650/lusamorenazaxawe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/learn_english_by_listening_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/memipefikopimukolus.pdfIn 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_off0000e65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65E 5540 bytes
SHA-256: 1fb0e5642f7caa380f6055bb0f2b5952dd844e547d93e4fa00986efad330833b
font_01_sfnt_off0000f93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93F 10976 bytes
SHA-256: ea4f73bd2c8ea42999bab1008263e79471e2285504fba3615228e34599c06824

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