Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3279c266640cbd5…

MALICIOUS

PDF

67.1 KB Created: 2021-01-12 08:50:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: bdfd9d08150e1d02042fccd84112d88c SHA-1: d6f9d424e7fd1a229a1c8bdbe9cae668a4a266dc SHA-256: f3279c266640cbd53c08b07071dfb52ab37076d64be77e0004cb96729694013e
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The primary URL, 'https://trafffe.ru/123?utm_term=blankets+craig+thompson+pdf+free', suggests a malicious intent to direct users to potentially harmful content. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the presence of numerous external links points towards a phishing or SEO manipulation attack.

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://trafffe.ru/123?utm_term=blankets+craig+thompson+pdf+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465685/normal_5fd30a14bb9be.pdfIn PDF document text
    • https://panikudar.weebly.com/uploads/1/3/1/4/131437701/kipumovemobox-dufuwenexi-jizegadep-zubixarapugeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474211/normal_5ffd242be801f.pdfIn PDF document text
    • https://gonufefimexej.weebly.com/uploads/1/3/4/8/134892828/julefilotizapili.pdfIn PDF document text
    • https://cdn.sqhk.co/rosomugimo/Uhcjbjg/21698667939.pdfIn PDF document text
    • https://cdn.sqhk.co/podiwilur/hbOnsFw/mech_legion_age_of_robots_mod_apk_download.pdfIn PDF document text
    • https://diwuxofemuji.weebly.com/uploads/1/3/1/4/131407179/e578cb8b9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/febopa/wifi_password_scanner_app.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/taxagorigo.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/72244553752.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/ac_current_sinusoidal_waveform.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/dubivawodajov.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_off0000c868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC868 5684 bytes
SHA-256: eedc5ea8a456d76fbc558eb2f3a58adab47ec611d1ec6b5dba2ff51972faf2e9
font_01_sfnt_off0000db91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB91 10188 bytes
SHA-256: 9f0e1e78c50ca92927e0b26e6059f27091fa6a7ad2c4a28768a8a4338fb955ef

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