Malicious PDF — malware analysis report

Static analysis result for SHA-256 92cd9a95b6320cac…

MALICIOUS

PDF

72.2 KB Created: 2021-01-15 13:49:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4a31adc14cb731e12f8eed1500277b03 SHA-1: 7f0b7850315f07b2769d38e5070e36cff3926348 SHA-256: 92cd9a95b6320cac412cef556d2c48826ba53026b4fe67d729cd6a8b037c1981
244 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'traffking.ru', which is disguised as a free WhatsApp download. This URL leads to a link farm hosted on disposable domains, indicating a phishing or scam attempt. The ML classifier and ClamAV detection further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffking.ru/aws?utm_term=whatsapp+app++free+for+android In PDF document text
    • https://tuxupifogufo.weebly.com/uploads/1/3/4/5/134594750/fovavaso_wanule.pdfIn PDF document text
    • https://cdn.sqhk.co/nokotadi/jMXieXK/mansions_of_madness_rules.pdfIn PDF document text
    • https://jodavetofa.weebly.com/uploads/1/3/1/4/131438562/956687.pdfIn PDF document text
    • https://site-1245341.mozfiles.com/files/1245341/47946954044.pdfIn PDF document text
    • https://tototatinup.weebly.com/uploads/1/3/4/3/134332383/dd7dd7a0.pdfIn PDF document text
    • https://nefatalij.weebly.com/uploads/1/3/2/7/132740339/sosejenixej_jilajuz_pebaderakuriw_mobow.pdfIn PDF document text
    • https://cdn.sqhk.co/jufulezamuko/gTjbhih/gufopesaboperekatiruf.pdfIn PDF document text
    • https://buxodofuluni.weebly.com/uploads/1/3/4/8/134875319/siwipejamoxot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383916/normal_60002ebbb7197.pdfIn PDF document text
    • https://xosesobo.weebly.com/uploads/1/3/4/6/134697532/jinag.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/rogugagatuf/anatomy_of_head_and_neck_mcqs.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/back_to_me_daya_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/sadivibag.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_off0000de61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE61 5108 bytes
SHA-256: b31556efc26f0ed647e58d2805fde180b9f0c8879d5ea6789ecc0fa6334c4051
font_01_sfnt_off0000efcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCC 10804 bytes
SHA-256: a2699ed671a849503cf19fdc5e557b9688c59354665be5eb121ccbbd23c0a198

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