Malicious PDF — malware analysis report

Static analysis result for SHA-256 0678217c097b30b6…

MALICIOUS

PDF

84.2 KB Created: 2021-03-11 22:55:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c288bb39e15470ff0808ee21e50bb325 SHA-1: b85610645d06f1f2ec81c54308e7b6c4c27f265d SHA-256: 0678217c097b30b64a245d2d51d89695cef541760be684c6de288b2ddbc1d141
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a large number of external links, including one to 'nipisod.ru', suggests a link farm or redirection tactic. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malicious content delivery mechanism, possibly leveraging embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nipisod.ru/award?keyword=freeletics+bodyweight+pdf
    • https://cdn-cms.f-static.net/uploads/4418191/normal_603f8699220b3.pdf
    • https://cdn-cms.f-static.net/uploads/4383913/normal_604188f971265.pdf
    • https://static.s123-cdn-static.com/uploads/4496826/normal_60086314859b9.pdf
    • https://cdn-cms.f-static.net/uploads/4483602/normal_60388227801ba.pdf
    • http://matepiruzozu.iblogger.org/gazifotirime.pdf
    • http://idem-peshkom.ru/cnc_router_tool_changer_kit2o66y.pdf
    • https://cdn-cms.f-static.net/uploads/4373768/normal_60279752760f5.pdf
    • https://cdn-cms.f-static.net/uploads/4420459/normal_6047ca89797cd.pdf
    • https://midagadin.weebly.com/uploads/1/3/1/3/131381693/2759478.pdf
    • https://sojenumodab.weebly.com/uploads/1/3/5/2/135296615/pajunoz_genizogovumuk_sepelezageke.pdf
    • https://cdn-cms.f-static.net/uploads/4408707/normal_6011b8964bb63.pdf
    • https://cdn-cms.f-static.net/uploads/4501233/normal_600db22bf1ff6.pdf
    • https://cdn-cms.f-static.net/uploads/4531626/normal_5fd85e1805ac1.pdf
    • http://naturwow.space/kenmore_elite_he3t_washer_resetd2351.pdf
    • https://cdn-cms.f-static.net/uploads/4450256/normal_600f0884c9a2b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wiwuxot/classic_wow_leveling_guide_horde_addon.pdf
    • http://wawefib.rf.gd/bumokobirat.pdf
    • https://s3.amazonaws.com/levovod/famous_daves_nutrition_corn_muffin.pdf
    • http://kaxemazetoralib.rf.gd/xopusesoniguxuzuz.pdf
    • http://senusekavopodu.rf.gd/certificate_award_templates_free.pdf
    • http://zuwemanikipe.rf.gd/texas_drivers_handbook_84_questions_answers.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4b6.bin
c22ae4bb9ed0ea56f3e8a6127d695b20a368af84f6f904105a76c57c5a1e9bcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B6 5496 bytes
font_01_sfnt_off00010778.bin
d48d7e8b74dedc9aa0e07ea229eba6ca7dcf5d980da2a6851e569fd33eb884cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10778 10724 bytes
font_02_sfnt_off00012c5f.bin
1a6f948cabbae8097a7f30df3e14922aa9436d0a77b69d086f5279bd059f8ab7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5F 16648 bytes

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