Malicious PDF — malware analysis report

Static analysis result for SHA-256 a47192d953abca2f…

MALICIOUS

PDF

78.6 KB Created: 2021-03-23 21:35:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 816e45f4e3d73d0a38edfec9272c4ec5 SHA-1: 169af337ab8f8ecbb0e86cb521521c8be3ae38f2 SHA-256: a47192d953abca2f04811767e17e607f51919f20d6ccf1e0af87a9295c81e03e
156 Risk Score

Malware Insights

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

The PDF contains a heuristic indicating a link farm with numerous external PDF links, one of which is a malicious URL. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though partially corrupted, contains a title related to 'how to train tai chi at home' which is likely a lure to direct users to the malicious URL.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/strik?utm_term=how+to+train+tai+chi+at+home
    • https://static.s123-cdn-static.com/uploads/4368492/normal_5fec463c32873.pdf
    • https://cdn-cms.f-static.net/uploads/4447466/normal_5fd63598da368.pdf
    • https://cdn.sqhk.co/jilowepe/eicFgiV/red_rose_tea_healthy.pdf
    • https://cdn-cms.f-static.net/uploads/4425772/normal_60148a311bb6c.pdf
    • https://static.s123-cdn-static.com/uploads/4407304/normal_60035388ab538.pdf
    • https://cdn.sqhk.co/silinetufid/chd13hh/63982328536.pdf
    • http://xilofomodat.iblogger.org/gevazuxelij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://8d6920c1-aef5-45ed-b1a0-e693d63948fb.filesusr.com/ugd/0a593f_6949c1a119fa4136a681a94203bd0eb9.pdf?index=true
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_f6a1caa18cd64be88583d3009649fe35.pdf?index=true
    • https://s3.amazonaws.com/jizubisetebof/pofoxegenolat.pdf
    • https://s3.amazonaws.com/kujapomib/11733556544.pdf
    • https://s3.amazonaws.com/zowejunef/99117195560.pdf
    • https://s3.amazonaws.com/rakabexozu/18573673174.pdf
    • http://zuvujenil.rf.gd/wanirokogow.pdf
    • https://s3.amazonaws.com/golepe/manual_bootstrap_angularjs_example.pdf
    • http://kofadoz.rf.gd/zoho_crm_tutorial_2020.pdf
    • https://s3.amazonaws.com/makumapikeze/elder_scrolls_morrowind_modding_guide.pdf
    • https://fd7a53fe-11c1-4e60-83ad-ac1bb997268f.filesusr.com/ugd/5cf23b_36b68762e31c424c97529ab777451bbb.pdf?index=true
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_e6009b5c29964095a649075d144e4a81.pdf?index=true
    • http://dadodoserosif.epizy.com/31506336039.pdf
    • http://kugovede.epizy.com/90243305726.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea12.bin
ef6e0bc7d210a680bfd88937b8dd9416dc49bfd3fb39411ce2cbfb384123d6a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA12 4672 bytes
font_01_sfnt_off0000f9bb.bin
f763964098e45e843168df42eb18d87bc9d676590b1c097bfd2e42569ce54198		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BB 10552 bytes
font_02_sfnt_off00011d94.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D94 4324 bytes

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