Malicious PDF — malware analysis report

Static analysis result for SHA-256 370adb74022dfb0b…

MALICIOUS

PDF

87.1 KB Created: 2021-03-21 11:08:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e769448b947a1eafe7b10f566584cd3d SHA-1: 49b386ab22e5f826d8e923f2bf8fa225d00c36c9 SHA-256: 370adb74022dfb0b622dc86b39b5511a1e87b782e7b4b30ea20fa2a5f99e1032
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or SEO spam. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the presence of embedded URLs and the PDF structure suggest an attempt to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=hewlett+packard+laserjet+4+plus+ink+cartridge PDF link annotation
    • https://cdn.sqhk.co/retesixabe/cighjJX/59363538438.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370087/normal_602bf6825dad4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471969/normal_5fd796de3b0a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487416/normal_6031267aade00.pdfIn PDF document text
    • https://cdn.sqhk.co/zufuxirap/T7jaBbx/89781875213.pdfIn PDF document text
    • https://cdn.sqhk.co/numobelez/eUAgc1a/android_tablet_with_stylus_2013.pdfIn PDF document text
    • https://cdn.sqhk.co/ranemagesoga/smzhdjj/87221385485.pdfIn PDF document text
    • https://cdn.sqhk.co/putuziboki/jjjgjd8/balloon_dog_ornament_artist.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454290/normal_603952f537c9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445114/normal_6028842866d48.pdfIn PDF document text
    • https://cdn.sqhk.co/sikibeve/YghKLgi/36226417773.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451369/normal_603f33e95629d.pdfIn PDF document text
    • https://cdn.sqhk.co/ketifoseja/be6hhNT/fastest_bowl_ever_in_cricket_history.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nixasosuj.epizy.com/76218139630.pdfIn PDF document text
    • https://712e085e-8422-4094-ae2e-709d430f1fc9.filesusr.com/ugd/bf8edb_bafae34c227b466395984dd473fcd04e.pdf?index=trueIn PDF document text
    • https://74fc1a11-d445-4ffb-bc6b-7a79e5a65a18.filesusr.com/ugd/097bd5_60d4abe3bc994982a8249c3b10eb0527.pdf?index=trueIn PDF document text
    • http://witeguxatuzidaj.epizy.com/general_biology_bio_101_laboratory_manual_answers.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_off00011496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11496 5524 bytes
SHA-256: 694e920be6bb0837d9f7e0ab551b6e6461f565c62418cf4ddb4e31b9efa57eba
font_01_sfnt_off0001278a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278A 11528 bytes
SHA-256: 9221aacf899f9524812dad568c1d7454245356e8db6ba9b84697ef3bcab6445b

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