Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e2b9d5c12f5395…

MALICIOUS

PDF

71.2 KB Created: 2020-12-21 06:25:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f852cd4746720cee2148aad58bf0ce8f SHA-1: be6f8ef2e7aca72ef6177e21e0012c6be75759f4 SHA-256: a2e2b9d5c12f5395a92cc8751042233a7fa764231a883768afc0633392aa6569
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, with one pointing to a URL that appears to be part of a phishing or redirection scheme. The document body, though heavily obfuscated, suggests a lure related to Craigslist apartment listings, which is a common tactic for business email compromise or phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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://trafficel.ru/strik?utm_term=craigslist+downtown+los+angeles+apartments
    • https://cdn-cms.f-static.net/uploads/4444657/normal_5fc1a17b4e3dc.pdf
    • https://cdn-cms.f-static.net/uploads/4380882/normal_5f929b43cab4c.pdf
    • https://cdn-cms.f-static.net/uploads/4473432/normal_5fbed85a0c3ba.pdf
    • https://cdn-cms.f-static.net/uploads/4501501/normal_5fbfbe131d1d9.pdf
    • https://cdn-cms.f-static.net/uploads/4379487/normal_5fb5bfea42844.pdf
    • https://gupufema.weebly.com/uploads/1/3/4/4/134456882/aec13a20794.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ce529556-6442-4385-920c-427f226977a7/the_lover_duras.pdf
    • https://s3.amazonaws.com/gonuxiwela/metformin_vs._berberine.pdf
    • https://s3.amazonaws.com/vesubodufisi/coldplay_hymn_songs_free.pdf
    • https://uploads.strikinglycdn.com/files/ec7ea163-ff27-441b-a3e0-f28a7831e142/barrons_essays_that_will_get_you_into_medical_school.pdf
    • https://s3.amazonaws.com/xeroguru/fegadenupetijowevizalewov.pdf
    • https://uploads.strikinglycdn.com/files/bfac09dd-4dc9-4040-bc11-c0ffbf9240fd/66716212912.pdf
    • https://uploads.strikinglycdn.com/files/2b15a9ff-dd68-4b37-9d5c-02502539515f/xasemikatexoxibokevirug.pdf
    • https://uploads.strikinglycdn.com/files/4bc22bf3-00fc-4d32-ad6a-6d01677b604c/67592384399.pdf
    • https://uploads.strikinglycdn.com/files/52c28c9e-63a3-44cf-aaea-95ceaddf09e1/7-5_practice_form_g.pdf
    • https://uploads.strikinglycdn.com/files/2ee796e1-9d3e-432c-9ff4-6b09eb459f80/nobody_knows_the_trouble_ive_seen_shrek.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_off0000da5b.bin
3403c14c43310613d8303afda859176e9f99528a6eb742a146f98699004d645f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5B 5276 bytes
font_01_sfnt_off0000ec46.bin
610686bf98c230ddc81d334647fcc2d932b392a792f9f3e17c769031d038b99d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC46 10332 bytes

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