Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6a93e39eb984bb1…

MALICIOUS

PDF

71.3 KB Created: 2021-05-22 09:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 62952da3e6d2f23a544235c38373d99e SHA-1: d589896349213072f72f9d402797ea90b08ed075 SHA-256: d6a93e39eb984bb16125b116cadac081803f3453d07a71771d18fafb868ad552
156 Risk Score

Malware Insights

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

The PDF file, identified as malicious by ClamAV and an ML classifier, contains a large number of external links, many of which are to benign-looking PDF files, suggesting a link farm or SEO poisoning tactic. One of the embedded URIs, 'https://dafemum.ru/strik?utm_term=engineering+mechanics+dynamics+2nd+edition+solutions', is suspicious and likely leads to a phishing or malware distribution site. The document body, though heavily obfuscated, contains keywords related to engineering mechanics and the authoring application, which are likely used as lures.

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=engineering+mechanics+dynamics+2nd+edition+solutions
    • https://zivumabozado.weebly.com/uploads/1/3/4/8/134858695/dogar_memovitizik_butojedumizife.pdf
    • https://static.s123-cdn-static.com/uploads/4449014/normal_6004429388515.pdf
    • https://gugajapu.weebly.com/uploads/1/3/5/3/135330564/2403328.pdf
    • https://jovapotokuxeb.weebly.com/uploads/1/3/4/8/134881142/dagurotorit.pdf
    • https://lajejajutabi.weebly.com/uploads/1/3/6/0/136050508/jotera-tarinozulinefa.pdf
    • https://zoxavemawoba.weebly.com/uploads/1/3/4/7/134728713/sexadanujuso.pdf
    • https://static.s123-cdn-static.com/uploads/4485318/normal_600340e8ac718.pdf
    • https://vebunigujop.weebly.com/uploads/1/3/4/3/134367951/sesir_mamulukoxe_magoselowikuzuz.pdf
    • https://memabalizova.weebly.com/uploads/1/3/4/4/134490842/e1426780fa3.pdf
    • https://tinonerapize.weebly.com/uploads/1/3/5/3/135349756/2033776.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/voxipanovigepiv/sexovexum.pdf
    • https://uploads.strikinglycdn.com/files/1eb2cae9-4a37-4c2d-9b35-3179b8eba5f6/nekejazuwosupogopesasimi.pdf
    • https://uploads.strikinglycdn.com/files/1f8b78a5-35af-4007-bdeb-bb1dbfe892fa/9671103818.pdf
    • https://s3.amazonaws.com/fusopoxipo/canon_430ex_ii_vs_580ex_ii.pdf
    • https://uploads.strikinglycdn.com/files/eeece3b4-449f-4541-b262-0823d41c4a03/calligraphy_cursive_penmanship.pdf
    • https://uploads.strikinglycdn.com/files/80de5640-69eb-413c-8f72-878942853624/para_que_sirve_la_vitamina_b6_y_el_magnesio.pdf
    • https://uploads.strikinglycdn.com/files/db1c48e7-0ed9-44ca-a649-53dcf2a5743f/hayward_power_flo_lx_pump_sp1515_parts.pdf
    • https://s3.amazonaws.com/womirofop/dark_souls_2_cheat_engine_ban.pdf
    • https://uploads.strikinglycdn.com/files/29dca422-65cb-4e64-a41c-b3d4e55a3d6e/vilefadutakufotip.pdf
    • https://uploads.strikinglycdn.com/files/235a1622-dfbc-4639-aff4-ee27dccd033c/91669103090.pdf
    • https://s3.amazonaws.com/pipaneku/constitucion_politica_de_la_republica_mexicana_1857.pdf
    • https://uploads.strikinglycdn.com/files/ae38f0c3-54fa-47b3-b85f-168a9c6a1f12/visateraw.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_off0000d886.bin
f73e69ab800434b643e6f7c96f53542c2b5fb1a56e2b647c0e93b7ab2eab94a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD886 5544 bytes
font_01_sfnt_off0000eb45.bin
ff6f67591575bcae0a766cc5385b73a1651cbe726348f6ffe7b814218284a253		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB45 10616 bytes

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