Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd5868541806c01b…

MALICIOUS

PDF

84.8 KB Created: 2021-03-20 16:58:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d7fc0fe0565e13326e6817ba15aa2e1 SHA-1: 50d50401d7478d02f73d9e453e94112af188036b SHA-256: fd5868541806c01b80b0a29cb70693d8b5ca7d5e08cb3cdedeed21050901e422
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing distribution scheme. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, indicating it was likely generated programmatically to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://jottigo.ru/strik?utm_term=is+it+ok+to+drive+with+a+squeaky+belt
    • https://cdn.sqhk.co/mawejoxejobe/hca9foA/mapuralutunidara.pdf
    • https://bovoladimuva.weebly.com/uploads/1/3/0/9/130970023/5a8b8b64f5b92c.pdf
    • https://jixusalozexifan.weebly.com/uploads/1/3/1/4/131407855/buluz.pdf
    • https://cdn-cms.f-static.net/uploads/4407562/normal_5fea040ccba72.pdf
    • https://cdn.sqhk.co/netimupoxojo/BihccGY/88806165849.pdf
    • https://cdn.sqhk.co/keximovib/djhZYge/helicopter_hands_dance.pdf
    • https://wanesutilujat.weebly.com/uploads/1/3/4/8/134868149/5455960.pdf
    • https://xexinujufametu.weebly.com/uploads/1/3/4/5/134502762/xeropujonewed.pdf
    • https://cdn-cms.f-static.net/uploads/4486351/normal_601ab62f6cf41.pdf
    • https://xijoxamapapi.weebly.com/uploads/1/3/4/3/134337958/fomovovusuwupavatij.pdf
    • https://cdn.sqhk.co/vixawutozama/bifZkjh/banner_saga_2_review.pdf
    • https://cdn-cms.f-static.net/uploads/4468530/normal_600e49b437b25.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/4333963a-fbdd-44bf-bc26-acd51b889108/how_to_start_ariens_compact_22_snowblower.pdf
    • https://b9a4c3d6-4ccf-4d04-9b0f-c2e9c357e15d.filesusr.com/ugd/e5cbe5_fbbb3c33573a4be29d15f0b4cc26fafb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2f53faa6-b5b5-493d-bcc3-8fadeb242294/37307560811.pdf
    • https://621cd70f-1aca-46de-91df-1bd8162c3e90.filesusr.com/ugd/9f1ad6_2cd3a6a55a704e70ba798826d3dd52f9.pdf?index=true
    • http://wuluzakasuw.epizy.com/aflao_brass_band_mp3_download.pdf
    • http://livasesokod.epizy.com/26147661541.pdf
    • https://uploads.strikinglycdn.com/files/76e507cd-0509-4541-a5c6-2616a0acab91/pci_express_ht2000_motherboard_manual.pdf
    • https://8ab8d0a6-ebcf-4503-ac90-3c5d9a0926ce.filesusr.com/ugd/8585d4_d4a7c9e1a243462482d89cc6a434f778.pdf?index=true
    • https://uploads.strikinglycdn.com/files/25c0e403-c465-4b4f-ad72-69adbaee6556/5614727701.pdf
    • https://a8a2d6b8-6248-42a0-90a4-e25e421c2e59.filesusr.com/ugd/f63f29_1fc00d3888a24077a286da22df446359.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f51d.bin
a28fcc4ba65d8171a55e8b87d646ac5d1dd213f66ab2b0026fd39e5ca5d32d1a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF51D 2900 bytes
font_01_sfnt_off0000ff5f.bin
5ad7c72400e0e55d66cb4b62695734ad1a3f23efc7c2afea66356ee72452bba1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5F 5212 bytes
font_02_sfnt_off00011140.bin
f9e35240a603eeac77b6089f3d9621d3ef64bdc0a4e8c54816e465be86d20e8e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11140 10528 bytes
font_03_sfnt_off0001355e.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1355E 4324 bytes