Malicious PDF — malware analysis report

Static analysis result for SHA-256 27f4f6a7fe15ef2c…

MALICIOUS

PDF

68.5 KB Created: 2020-11-23 16:12:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a185a79edafa9b1bc889d6f93dd884c9 SHA-1: 1931de41c3303dd83bdeeaae88f0db2345ce51ad SHA-256: 27f4f6a7fe15ef2cf9168f64d3e37642184738e74b7e94f8247ba4de8432e6ae
234 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a callback lure heuristic suggests a phishing or scam pretext, likely to trick users into calling a fraudulent support number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://traffmen.ru/123?utm_term=san+francisco+paratransit+jobs
    • https://rafogemi.weebly.com/uploads/1/3/4/7/134754229/3072cc02ffe66f0.pdf
    • https://mogidudurunupiz.weebly.com/uploads/1/3/2/6/132695636/paxatalumowud.pdf
    • https://sazadasixitabe.weebly.com/uploads/1/3/4/4/134404720/3abf7.pdf
    • https://mibakadediwo.weebly.com/uploads/1/3/4/5/134584598/didawokunofuvil.pdf
    • https://lutilaxo.weebly.com/uploads/1/3/4/5/134599665/9159803.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2ce2a429-f758-4806-8c36-5a973f7791f1/jamif.pdf
    • https://s3.amazonaws.com/xokebore/48488526266.pdf
    • https://uploads.strikinglycdn.com/files/31bc0e1d-2015-4bd3-95cf-d72dd70c9e98/revised_knight_templarism_illustrated.pdf
    • https://s3.amazonaws.com/jebupofedijakuk/65989510024.pdf
    • https://s3.amazonaws.com/nopomewegobij/42294600362.pdf
    • https://uploads.strikinglycdn.com/files/738ebee4-2a9b-40de-8dbf-beeeb68cded5/tafanagefegubanor.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_off0000cf2f.bin
18ff74d913db5bf75c065d3a5b406564f4efa1bd1124026252188b625e44ec0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2F 5296 bytes
font_01_sfnt_off0000e143.bin
d981127873c75360f5a61e197d9bfcbf4e4aeb672546bc30ce1d328ac80c1372		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE143 10532 bytes

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