Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ab7b688e59060df…

MALICIOUS

PDF

143.3 KB Created: 2020-11-19 06:18:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 93d61c7b012990d89d22e8a425e111c1 SHA-1: 94ee261188ac7356a74684c71433c9b7f123353c SHA-256: 7ab7b688e59060dff52b4c6e98aeb68a7451fce798cb282ecb34c909c0ffd9e9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan distribution attempt. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious content or download further payloads.

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://traffine.ru/aws?utm_term=cytonn+annual+report PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413467/normal_5f9653e018e9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458829/normal_5fac2df346643.pdfIn PDF document text
    • https://fapasinexiri.weebly.com/uploads/1/3/4/3/134346339/51c671d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383922/normal_5f924531dd1c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392857/normal_5f9711e1bf6f2.pdfIn PDF document text
    • https://wevupifusa.weebly.com/uploads/1/3/4/3/134356286/fudezudubedulo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373259/normal_5f8cb6306af7d.pdfIn PDF document text
    • https://gugabezari.weebly.com/uploads/1/3/4/5/134577353/luvakujuloxipavepu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365545/normal_5f8978493110a.pdfIn PDF document text
    • https://dokodajibebabek.weebly.com/uploads/1/3/2/3/132302773/ec71e6.pdfIn PDF document text
    • https://mojipolizu.weebly.com/uploads/1/3/4/3/134318612/vulorixavoz.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/4e82f390-bac7-4922-b07b-8ae5786ec019/usa_sex_guide_strip_club.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/change_file_to_word_document.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/93030144203.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b9c74d3-1774-476e-8a63-f151b875931a/craft_cms_create_templates.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_off0001f8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F8AB 4644 bytes
SHA-256: 6401a9ee7770f285d38d3be916d0c92723eff454d7ae9d30c27f798a31f29471
font_01_sfnt_off00020887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20887 11608 bytes
SHA-256: bf1efbcfc6e4d816d09852017262ea781e1c6eb00d1eeb3b9204046be11eb076

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