Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c130d813a46c3e2…

MALICIOUS

PDF

76.7 KB Created: 2021-04-02 02:40:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3d9091d0e7fe9db1500270a61c3f723c SHA-1: aab5eb7f456abaeddfe5971c570c5e2a1ce3c212 SHA-256: 2c130d813a46c3e2cea9a7e4faefa67d8135c0c2ffb5ccd0177da756714efc29
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The presence of a large number of external links, including one to 'bologen.ru', suggests a phishing or SEO spam campaign. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://bologen.ru/wix?keyword=dating+a+mongol+biker PDF link annotation
    • https://cdn.sqhk.co/bemapebe/T3Sibgg/jurnal_akuntansi_sektor_publik_terbaru.pdfIn PDF document text
    • https://cdn.sqhk.co/naxupowu/iqRjcQO/vepawaweses.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/222404a3-181b-4a86-a2aa-3991ace41126/have_it_all_lyrics_cosmos_midnight.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/sodadujepizu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8186f954-fb1d-4d01-932e-c64b3b837172/20602240966.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69b47f7f-bde6-49c4-bfbc-d403cad3d298/hunter_x_core_controller_dial_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/antenatal_care_guidelines_rcog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e723d985-6d9d-41d6-9cc3-8e0a6d4e17cf/cours_grammaire_francais.pdf_gratuit.pdfIn PDF document text
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_274a8d5308a949a3a6ccb4e357bf28b8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc511932-ad8b-4b4f-aada-518870ef289e/spanish_words_that_start_with_o_objects.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/buluzebusikijojab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31022bcb-1d70-4f9a-9f10-a2c71093a97f/53564025081.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03d65fc6-05b3-4208-bb06-817ec89d9053/38537862978.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43578ad1-691a-4653-92e8-748a0d562bbc/what_is_the_original_name_of_chess.pdfIn PDF document text
    • https://ddd90330-5837-4e0c-b2f6-9383941cd2db.filesusr.com/ugd/568e2c_20ac9e721746454194b250703b6506ca.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dotivaf/lofimat.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_off0000ec31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC31 5028 bytes
SHA-256: 3135d8e9e6121c6aae22a1b89be5355f0f508a356120820a415cdbc64a607e3b
font_01_sfnt_off0000fd46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD46 11688 bytes
SHA-256: fa00a80628cedb533c902d35a0784f29afa71afcc295bd69e4f17f7423ddfd45

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