Malicious PDF — malware analysis report

Static analysis result for SHA-256 240e4b6af2ec3463…

MALICIOUS

PDF

69.4 KB Created: 2020-11-14 22:25:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: ba480c6f54884c3ad075384f5ce10638 SHA-1: 5c8f6cde9234a7051f3847d52f6169b4dae0c0ed SHA-256: 240e4b6af2ec3463a8cca3da736eae83c0f7a32d258fbd97ee616a1b4cd68cc0
244 Risk Score

Malware Insights

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

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier. It functions as a link farm, containing numerous embedded URLs that point to potentially malicious or spam-related websites, including a known redirector. The document body is heavily obfuscated, but the presence of a large number of external links suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ggtraff.ru/123?utm_term=fun+run+2+-+multiplayer+race In PDF document text
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/bazoliv.pdfIn PDF document text
    • https://sanuvexugivi.weebly.com/uploads/1/3/1/6/131606490/kerofamexiral-muzukolu-jawojunapi.pdfIn PDF document text
    • https://fujireroxilurig.weebly.com/uploads/1/3/4/6/134649353/wezow-fufopuzo-bokil.pdfIn PDF document text
    • https://lagafuxomip.weebly.com/uploads/1/3/4/3/134347440/4750525.pdfIn PDF document text
    • https://bizevino.weebly.com/uploads/1/3/4/3/134320064/mopedirafoxejed_xadufuzimedes.pdfIn PDF document text
    • https://rilebowiteb.weebly.com/uploads/1/3/3/9/133986594/8977051.pdfIn PDF document text
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/tiruvokanozi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452372/normal_5fabac8db9d51.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/991d3a46-5fde-4e7b-96a3-6261f314faac/8807948730.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/605fbb07-fc9c-4fca-90de-8d9055f397ee/61946304178.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48cfd1db-6641-4306-a0ad-109605bc9fcf/kuzibozirekoxodomejejig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88a30ae9-63e1-4a55-b764-dabf3260792a/the_chris_farley_show.pdfIn PDF document text
    • https://s3.amazonaws.com/sirasu/playhome_mods_list.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_off0000d3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B9 5120 bytes
SHA-256: 19d902ffecfdd8e86838be6b07e7dd3db60b57f6e19f902923b24927f272bba3
font_01_sfnt_off0000e524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE524 10356 bytes
SHA-256: fb6cb0bae83fc34ac7d80a1a234916af24e653cc4c76959ecd3e3d6045cebbb2

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