Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a6de5fd388c238d…

MALICIOUS

PDF

73.1 KB Created: 2021-01-01 04:34:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 49bee133ef8dc93583498e2fa23a389e SHA-1: ddd77328fb7c782739b087ad3c4ff3a515852790 SHA-256: 5a6de5fd388c238db67d8cbbdfcdff0be6d38a20634025176cd7f81d244c407b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and a phishing attempt. It contains numerous external links, many pointing to disposable domains, suggesting an attempt to manipulate search engine results or direct users to malicious content. The ML classifier and ClamAV also strongly indicate maliciousness, with ClamAV specifically identifying it as a Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffnew.ru/123?utm_term=sodium+lauroyl+isethionate+for+skin PDF link annotation
    • https://xemudimiju.weebly.com/uploads/1/3/4/8/134861016/nufogipigubu_tibuxu.pdfIn PDF document text
    • https://ridawixesij.weebly.com/uploads/1/3/4/6/134660161/2923765.pdfIn PDF document text
    • https://lixaworone.weebly.com/uploads/1/3/1/8/131871871/2887594.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370778/normal_5f9399912a2c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449178/normal_5fad5899db4da.pdfIn PDF document text
    • https://zoforofutesabuw.weebly.com/uploads/1/3/4/7/134751738/16e56a6723bb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420235/normal_5faa81b8e9bd5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422168/normal_5fc8d6d959b8b.pdfIn PDF document text
    • https://fozogefijegajor.weebly.com/uploads/1/3/1/4/131453134/tesibapas-tubafejarezo-zobukusitoval.pdfIn PDF document text
    • https://winulovovitazu.weebly.com/uploads/1/3/0/7/130740324/5018467.pdfIn PDF document text
    • https://viwefinorix.weebly.com/uploads/1/3/0/8/130813514/92078.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wizedumi/booksmart_google_docs_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/allegiant_reading_studios.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_off0000e1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DD 5416 bytes
SHA-256: b91fdfe6a5ae46f5dd578830eec03282f1178b3ce875cb79c02f1a85af89be40
font_01_sfnt_off0000f420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF420 10300 bytes
SHA-256: a0257a08010471cc856618d3c2b78ffa5fb280861b1a1aa74a8472054750f56b

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