Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7b679e6d9c8d89…

MALICIOUS

PDF

89.0 KB Created: 2021-06-02 11:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8792b19a871cfbd6ac638a76977d74c8 SHA-1: 467bf2a141860697c0ea61d48dee8250757787bb SHA-256: ef7b679e6d9c8d896c35bb6c0bd70fb36a7dc5763920185f1b57fed350b2f3bf
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and likely phishing-related. It contains a large number of external links, many pointing to PDF files hosted on various platforms, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, appears to reference 'Synology nas installation guide', indicating a lure to attract users interested in technical topics. No scripts were extracted, but the extensive use of external links points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/123?utm_term=synology+nas+installation+guide
    • https://fupigipefixoxom.weebly.com/uploads/1/3/1/3/131379213/997529.pdf
    • https://cdn-cms.f-static.net/uploads/4393190/normal_6047f822235d9.pdf
    • https://static.s123-cdn-static.com/uploads/4497348/normal_5fffc06708ea5.pdf
    • https://cdn-cms.f-static.net/uploads/4417037/normal_60334a73ad6e2.pdf
    • https://boxatikavizag.weebly.com/uploads/1/3/4/6/134680825/7898186.pdf
    • https://murudogukezopo.weebly.com/uploads/1/3/4/3/134320821/3dfe2af5a.pdf
    • https://static.s123-cdn-static.com/uploads/4455881/normal_5fceac0cd846e.pdf
    • https://cdn-cms.f-static.net/uploads/4450625/normal_606e0b34bdd8a.pdf
    • https://rivixemip.weebly.com/uploads/1/3/4/6/134609840/4033000.pdf
    • https://kotekadugufed.weebly.com/uploads/1/3/6/0/136086248/vegojo.pdf
    • https://cdn-cms.f-static.net/uploads/4380881/normal_6011e0511be45.pdf
    • https://gesogakit.weebly.com/uploads/1/3/4/5/134581759/jasufedurirago_darabuvex_fazot_fodoz.pdf
    • https://cdn-cms.f-static.net/uploads/4485301/normal_605d4e9d8ed12.pdf
    • https://cdn-cms.f-static.net/uploads/4451230/normal_6014814ead274.pdf
    • https://tasitonedilegu.weebly.com/uploads/1/3/5/3/135301248/649e387d9bd5.pdf
    • https://cdn-cms.f-static.net/uploads/4424043/normal_60341818f32fe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vawaguzidatu.pbworks.com/w/file/fetch/144423951/lofuneko.pdf
    • http://foziwedugumu.pbworks.com/w/file/fetch/144441384/how_to_clean_scansnap_ix500.pdf
    • http://letonepamusi.pbworks.com/f/.pdf
    • http://nikekuva.pbworks.com/f/16374523762.pdf
    • http://gifavipa.pbworks.com/f/13431116996.pdf
    • http://paderukut.pbworks.com/f/migopev.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012085.bin
628f1e9465271f03a589eb8458a268fb089d0a8fa057d210dda66c4d711b20d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12085 5104 bytes
font_01_sfnt_off000131f9.bin
7472c573d1920a5350f8d3bd36a07a3fb5877a10ed77618c00aa8e225e7123df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131F9 10580 bytes

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