Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7132f760bace499…

MALICIOUS

PDF

73.7 KB Created: 2020-11-22 07:50:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ffd4b09d8ff93a2c0a80dbd483b0f930 SHA-1: 53b8a7312dc92e518271d207f6452a52f2811615 SHA-256: f7132f760bace4991ac9371fc7aab0ce0dd4b7fe2c3e8baa2ce478c4b7b51451
164 Risk Score

Malware Insights

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

The PDF document contains a heuristic indicating it is a link farm, with one specific URL identified as a potential lure for financial calculations. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the presence of embedded external links and the 'Fake invoice / payment lure' heuristic point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://traffnew.ru/123?utm_term=chit+fund+calculator+for+2+lakhs
    • https://nofizosol.weebly.com/uploads/1/3/4/5/134500220/dumobif.pdf
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/lexodixinalevepon.pdf
    • https://dogirewepa.weebly.com/uploads/1/3/1/8/131856222/fusaj.pdf
    • https://cdn-cms.f-static.net/uploads/4462368/normal_5fb2dad8ac6e0.pdf
    • https://cdn-cms.f-static.net/uploads/4380675/normal_5f8e9e445ce49.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/2db7e1ee-6828-4d92-b173-6a3337adb1f6/67591081185.pdf
    • https://uploads.strikinglycdn.com/files/8bb8ec7e-02f2-4a26-b31a-fa061515db79/uttrakhand_govt_jobs_2018_2019.pdf
    • https://s3.amazonaws.com/banula/letter_of_intent_to_apply_for_a_teaching_job.pdf
    • https://s3.amazonaws.com/tosevud/calypso_music_information_facts.pdf
    • https://s3.amazonaws.com/bevekizadoxuj/digestive_system_worksheets_with_answers.pdf
    • https://s3.amazonaws.com/firigugixujotov/69164622018.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_off0000d47b.bin
ec215dcec5032883d9791f57cc2aebcbdee0d15a37c79151e09bfe6dd065705f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD47B 5092 bytes
font_01_sfnt_off0000e5b2.bin
9b6016427e8e0c18de7043c67ad699e4eadb21e2c84d26283c7996dd70618219
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B2 11164 bytes
font_02_sfnt_off00010bd6.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD6 4324 bytes