Malicious PDF — malware analysis report

Static analysis result for SHA-256 c40d1a1c42f93ff1…

MALICIOUS

PDF

71.3 KB Created: 2021-01-07 21:34:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: c351cbdbe762f7545a7a96481b918469 SHA-1: 7409ba9c25e5c468f687e7866b6197d5aede621f SHA-256: c40d1a1c42f93ff1a0f183737bd1e057774940e71abae8fe021eeeeebbacfd96
264 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links pointing to external PDF documents, many hosted on disposable domains. This behavior is indicative of a link farm, potentially used for SEO manipulation or to distribute further malicious content. The presence of a malicious redirector URL and ClamAV detection further supports its malicious nature. No scripts were extracted, and the document body was heavily obfuscated, limiting direct analysis of its payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • 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/aws?utm_term=kurlon+foam+sheet+for+sofa In PDF document text
    • https://cdn-cms.f-static.net/uploads/4454824/normal_5fe6871c20e76.pdfIn PDF document text
    • https://raxagipob.weebly.com/uploads/1/3/4/8/134883443/paruboz.pdfIn PDF document text
    • https://zalopajozi.weebly.com/uploads/1/3/1/4/131453352/vidikufirupawogatubo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447669/normal_5fb2d54d62020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447647/normal_5faa5a4b6e9d4.pdfIn PDF document text
    • https://zezevibowavaki.weebly.com/uploads/1/3/4/8/134854125/jejovarur_vegivawo_pukivoki.pdfIn PDF document text
    • https://tizupokewa.weebly.com/uploads/1/3/4/0/134013062/webaxuz-vepimar-meterexeser-libimogo.pdfIn PDF document text
    • https://gosawopidelogeb.weebly.com/uploads/1/3/4/7/134714887/9921710.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449000/normal_5fa89a2e008df.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/genedesowul/60009935745.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9c27cb0-e11c-4626-ad74-3414e73dcc49/el_misterio_de_orion_robert_bauval.pdfIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/excel_template_checkbook_register_2007.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_off0000d80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80A 4976 bytes
SHA-256: ee7ef9d762a6d82ff13efba42d55afeaad73e20f3f843af2505499c43e10cc62
font_01_sfnt_off0000e8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CA 12644 bytes
SHA-256: dd37237d8fd936a00f53bb8d01bba03ea0abc54c431d9410dd77dcf477a5adc4

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