Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cee72d2eaff5e56…

MALICIOUS

PDF

72.3 KB Created: 2021-06-13 05:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7afac22e76d805c5c2c39083c03a610c SHA-1: b0fd0ea88343799d8329f8085e22292005e85999 SHA-256: 1cee72d2eaff5e56b98c96a133732b0e0b8c1e457ebcd95750a814a6469b39e9
134 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 and presents a deceptive download button. 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/pbw?utm_term=vygotsky+social+cognitive+theory PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485446/normal_5ff428bce466c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473041/normal_6050688777e98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383170/normal_605863529c70e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402960/normal_5fec5060b8373.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4389354/normal_60b2f347d0102.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503578/normal_60c0531483acf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xovelezid.pbworks.com/w/file/fetch/144878118/new_tamil_2021_movies.pdfIn PDF document text
    • http://ronuzexem.pbworks.com/f/gajomerirakorovuvan.pdfIn PDF document text
    • http://gipomebepate.pbworks.com/f/what_are_the_differences_between_aerobic_and_anaerobic_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0489fd77-5945-4455-84c0-0edc0b0a5ccc/bodyweight_exercises_for_biceps_no_bar.pdfIn PDF document text
    • http://jeveriwilum.pbworks.com/w/file/fetch/144599211/38419797275.pdfIn PDF document text
    • http://febokipup.pbworks.com/w/file/fetch/144578640/what_is_a_quintile_rank.pdfIn PDF document text
    • http://ruxafonan.pbworks.com/w/file/fetch/144492381/xuxadunavo.pdfIn PDF document text
    • http://sizolasipape.pbworks.com/w/file/fetch/144578169/koremukan.pdfIn PDF document text
    • http://juboxeraris.pbworks.com/w/file/fetch/145116585/57972107556.pdfIn PDF document text
    • http://lajunola.pbworks.com/w/file/fetch/144877986/62827903227.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76a615c7-3ec4-4320-9d74-75def000c5ba/luliwukumawoxifezix.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_off0000decc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECC 5252 bytes
SHA-256: 473f5a543756639a6d4134aae480b9933bdd71bb93bcfab598c4586cf389a1a5
font_01_sfnt_off0000f0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BF 10440 bytes
SHA-256: a55d460840651f95db90a08839e47fc792fde5852b619f1f85a92051f86b52a4

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