Malicious PDF — malware analysis report

Static analysis result for SHA-256 5083f231b552b5e5…

MALICIOUS

PDF

68.3 KB Created: 2021-02-11 16:53:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7c5a16eb5ebb9e9b6699e1b8ed0d17b0 SHA-1: 9881ed4e7ff08b33bbcf21756fe3040f8b31a4cd SHA-256: 5083f231b552b5e50f7355eba4ef9f232fc690e8ed4979a9864e0caf88b433a9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it contains malicious content. It functions as a link farm, containing numerous external links to other PDF files hosted on disposable domains, as detected by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. This suggests an attempt to manipulate search engine results or distribute further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/123?utm_term=the+horizon+report+2018 PDF link annotation
    • https://pufedoxavode.weebly.com/uploads/1/3/4/6/134613169/4289020.pdfIn PDF document text
    • https://biteledazuxol.weebly.com/uploads/1/3/4/3/134315761/muzinudazakilirewut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450512/normal_5fd3956185f63.pdfIn PDF document text
    • http://hq-cleartv.info/samsung_family_huba7zjl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495400/normal_601af4ad4a1d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408862/normal_5fc6dea9e9f7e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484156/normal_5fe50108b1a96.pdfIn PDF document text
    • https://dataremidesop.weebly.com/uploads/1/3/4/6/134697992/naveroputupumerepawi.pdfIn PDF document text
    • https://gapikedezasede.weebly.com/uploads/1/3/1/4/131438622/7451343511e34e.pdfIn PDF document text
    • https://dawipufa.weebly.com/uploads/1/3/3/9/133986453/ef01b1f3faffa8.pdfIn PDF document text
    • https://lefizedut.weebly.com/uploads/1/3/2/6/132681647/436479.pdfIn PDF document text
    • https://cdn.sqhk.co/nobixapo/yqjjgdW/sprint_drive_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456377/normal_5fd63c7436b86.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389358/normal_5fcc8e326689f.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_off0000d178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD178 5008 bytes
SHA-256: 577ac202826f51d2fe46dcda50a504263e5d944811f53ea4ca1dfb98bf2deeed
font_01_sfnt_off0000e28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28D 10000 bytes
SHA-256: 2b2c0777c4de45a4393bead4c00da8f863441462a2f360bc6f0f1160967f9620

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