Malicious PDF — malware analysis report

Static analysis result for SHA-256 203fd3f9233b181d…

MALICIOUS

PDF

75.9 KB Created: 2021-04-02 07:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 4eff63a84fdbf8c6f75f6cb9afd3128b SHA-1: b92864a918202b2e74de6bb54e0eb0f65d74cad5 SHA-256: 203fd3f9233b181d89977bafed92b3484b729ae3d25842c9d1a33d4bf9015bde
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or redirection to malware. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a malicious workflow designed to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/strik?utm_term=electrical+engineering+for+dummies+book PDF link annotation
    • https://nagiwudulowep.weebly.com/uploads/1/3/0/7/130775657/9ee27c.pdfIn PDF document text
    • https://piwirajaluz.weebly.com/uploads/1/3/5/3/135312697/1030258.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391636/normal_5fea1151c2a10.pdfIn PDF document text
    • https://gitasojozatoj.weebly.com/uploads/1/3/0/9/130968906/383185.pdfIn PDF document text
    • https://mefupajudeto.weebly.com/uploads/1/3/4/8/134883840/1211660.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469136/normal_5fcc3b2c15671.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371788/normal_5fdbd1891de75.pdfIn PDF document text
    • https://xikagarema.weebly.com/uploads/1/3/4/4/134489929/81948.pdfIn PDF document text
    • https://sawuvuvexefiz.weebly.com/uploads/1/3/5/9/135964560/123503.pdfIn PDF document text
    • https://boxomuti.weebly.com/uploads/1/3/4/0/134016719/kokuvasotosima.pdfIn PDF document text
    • https://jazigibebegada.weebly.com/uploads/1/3/1/6/131606339/4830877.pdfIn PDF document text
    • https://rixikevepu.weebly.com/uploads/1/3/1/4/131408169/6111078.pdfIn PDF document text
    • https://luxiwejewukon.weebly.com/uploads/1/3/0/7/130738755/5766760.pdfIn PDF document text
    • https://fowuwulavo.weebly.com/uploads/1/3/4/7/134754099/konuxumafisukefoma.pdfIn PDF document text
    • https://zizobisorodevu.weebly.com/uploads/1/3/5/9/135964877/zevigatu-kovesupi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b1d4f555-1eac-4d61-aa83-27206cf3ee4b.filesusr.com/ugd/1706f5_d0bb3954b7864f5c803b187d5f7db6a5.pdf?index=trueIn PDF document text
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_eda972fff2db4e0b927bc4a01017c6e5.pdf?index=trueIn PDF document text
    • https://d8d691c7-cf48-432b-bece-a54604b57851.filesusr.com/ugd/1e3a4b_743effa076124345966a7a62f668ad9f.pdf?index=trueIn 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_off0000eaca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACA 5500 bytes
SHA-256: 6b1295ab0e2d3612082d154186516b7ac4ebb6a618306a7c6be5db6c31544684
font_01_sfnt_off0000fd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD73 10756 bytes
SHA-256: a122a2ed5bbf990295c4182db85977c8f5ffa50fc791db95cdbe611caca95f05