Malicious PDF — malware analysis report

Static analysis result for SHA-256 880fe1402a34250a…

MALICIOUS

PDF

68.2 KB Created: 2021-05-26 16:40:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a01ae4aa4a5e1ff7168b4878662ea45b SHA-1: 4470940674a9c34a5891ce0dc9f855afa970c0ee SHA-256: 880fe1402a34250a800e58c71c43f2f415694bff665bbd7839e4a6c6cb4184f3
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://ponafet.ru/strik?utm_term=what+is+the+density+of+topsoil PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4476270/normal_5fe22f535d8b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489598/normal_5fd62e1b4401b.pdfIn PDF document text
    • https://bafizotadax.weebly.com/uploads/1/3/4/7/134761596/9815287.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449775/normal_6021c39e7bf0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444882/normal_603b5a9221019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421208/normal_6012cab1e1ede.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460723/normal_5ffdfe550e8a0.pdfIn PDF document text
    • https://lerekisisag.weebly.com/uploads/1/3/1/4/131408666/xufoniwis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412762/normal_5fe8ddafe556f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415756/normal_600250218ab4f.pdfIn PDF document text
    • https://dakurawal.weebly.com/uploads/1/3/5/3/135321076/64ee5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373248/normal_5fec33f658ea0.pdfIn PDF document text
    • https://likuwiwekadu.weebly.com/uploads/1/3/1/8/131857000/basani.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450336/normal_606101b64c6cf.pdfIn PDF document text
    • https://foduvixet.weebly.com/uploads/1/3/4/4/134498725/wowetorinegel-darigekelasi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368266/normal_6025025c4118b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416923/normal_60653282d0566.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369506/normal_605e0d84873f4.pdfIn PDF document text
    • https://rilokudewagozem.weebly.com/uploads/1/3/4/5/134597993/bdd7f461.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449605/normal_5fda59205b8e4.pdfIn PDF document text
    • https://remitibomuko.weebly.com/uploads/1/3/4/8/134853657/6621235.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403141/normal_5fd7bf8d7ea1c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000cce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE2 5148 bytes
SHA-256: b852934d453e683333a3f535aec4c30b2db64139e489f8e969e3b705ecc3052f
font_01_sfnt_off0000de7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7F 10660 bytes
SHA-256: 99cd942ddf5427e97acc10d91291627a31597eec74ba98cbf20044ff01026738