Malicious PDF — malware analysis report

Static analysis result for SHA-256 74fb5172acfb3e1a…

MALICIOUS

PDF

74.7 KB Created: 2021-01-11 03:48:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6d67c6f7d29bcd250e22b63d48d2c6b1 SHA-1: ecfcc9963826e93a30bf24f154e2dfe0b01339d2 SHA-256: 74fb5172acfb3e1aa082779281f6bc0cf371125de5de2cb024ad292625088cb6
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external links, including one to "trafficel.ru", suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains references to "cochlear implant diagrams" and the wkhtmltopdf tool, indicating a potential lure to disguise the malicious intent.

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://trafficel.ru/123?utm_term=cochlear+implant+diagrams PDF link annotation
    • https://cdn.sqhk.co/guzunilepin/e5hgTmL/72712570084.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497646/normal_5fe6329e51cfe.pdfIn PDF document text
    • https://tivaxuxilo.weebly.com/uploads/1/3/4/1/134131375/vimajokokuj.pdfIn PDF document text
    • https://cdn.sqhk.co/rolekixawute/iohcoYk/rexubobizosijavitumator.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486775/normal_5fcbbb3f294e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365619/normal_5f889970b5b18.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/Vicibja/bedroom_furniture_sets_with_desk_uk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494883/normal_5fac269c66dd4.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/kelageketisefuv/adobe_audition_cs6_full_crack_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/60820162590.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/calling_your_name_by_young_thug.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/musik_bandung_lautan_api.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/16214155193.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_off0000e856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE856 5392 bytes
SHA-256: c00716a0afdc54acd486ae7e2f6d9acecb31be4491cb22a5597016f221ce3e03
font_01_sfnt_off0000fa7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7C 10376 bytes
SHA-256: 38792b9b15df711a47e5da10f68d1106ac11b725629ea1edb4e5cfe7e338f264

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