Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d898da8d114e470…

MALICIOUS

PDF

72.1 KB Created: 2021-06-06 11:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a8fce9cf9f6611a0a766bfcb9b17934f SHA-1: ced347d90186060db82dd64a29f1c6d847e4bdf7 SHA-256: 1d898da8d114e4706037f5f0f0d16e12f66c4f0818dbbd3ddada5b72488af201
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. While no scripts were extracted, the PDF structure and embedded URLs point towards a tactic of redirecting users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://archism.ru/pbw?utm_term=5+ejercicios+de+regla+de+tres+compuesta+resueltos PDF link annotation
    • https://nukawidizuzaxep.weebly.com/uploads/1/3/3/9/133997642/2918998.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482636/normal_6031832d0a889.pdfIn PDF document text
    • https://vokewubepil.weebly.com/uploads/1/3/4/4/134443825/kafinexusedame.pdfIn PDF document text
    • https://keladita.weebly.com/uploads/1/3/0/7/130739570/9096ba78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420743/normal_6039f92ff25f3.pdfIn PDF document text
    • https://fubuzupa.weebly.com/uploads/1/3/5/3/135324320/jojewunujomon.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4467926/normal_60b05b2b52723.pdfIn PDF document text
    • https://waderiraxobo.weebly.com/uploads/1/3/4/5/134505054/abe77.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470981/normal_6008293f4a787.pdfIn PDF document text
    • https://xitofubipu.weebly.com/uploads/1/3/4/3/134375163/1d416e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445130/normal_604871465cf84.pdfIn PDF document text
    • https://motonikepo.weebly.com/uploads/1/3/0/7/130739202/zoronotixekemoxig.pdfIn PDF document text
    • https://zigajimimokok.weebly.com/uploads/1/3/1/3/131383588/9c56a8fcf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485153/normal_604a3d2b153f7.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/fcf51899-6941-4a19-ae5f-2640f64af93b/insinkerator_waste_disposal_unit_65.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a40116b-b7a3-47f1-a2b5-a8638f0bc2e3/fitegigevatatesiru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62e6fe10-979c-4a9b-bbc1-132a6cc5dc1a/subject_and_predicate_exercises_with_answers_for_class_6.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_off0000d8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FF 5500 bytes
SHA-256: 44ecdcd73cde829e00fff2757f5acd6ab903f35e95274c4b5c0a6b56a1c51d43
font_01_sfnt_off0000eba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA2 11684 bytes
SHA-256: d28f5e80c44f351184d8a21668abc114e8f676cbc6ad04fbf0e7e4817f732436

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