Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dff9db693d5f064…

MALICIOUS

PDF

113.8 KB Created: 2021-03-15 16:48:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 4de9e1f65dfb3b3cffcb2c8283928692 SHA-1: 63fb06813f9370851e759f3d1ea96594082166df SHA-256: 6dff9db693d5f064cfbe854eb2beef5186e7e35fca47a445243183fb5222f4de
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 of which point to disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites, potentially leveraging embedded JavaScript for obfuscation or execution.

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://ponafet.ru/aws?utm_term=child+of+a+lesser+god+definition PDF link annotation
    • http://gta-msk.ru/954328248136pbsy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381551/normal_601bfb7cbdb90.pdfIn PDF document text
    • http://icily.xyz/jilivajurusezoz0psnd.pdfIn PDF document text
    • https://sinuxogutit.weebly.com/uploads/1/3/4/5/134505158/deluwurilodafirosepe.pdfIn PDF document text
    • http://flowerport.market/76601190089mfbo5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366004/normal_601d7e72490bf.pdfIn PDF document text
    • https://koloputumoti.weebly.com/uploads/1/3/4/8/134887370/4554413.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416927/normal_5ffbd5e17eb61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485927/normal_603194022e748.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369307/normal_603e9276ecd30.pdfIn PDF document text
    • http://mabay.fun/pulizofujapaburepidimowo7cr95.pdfIn PDF document text
    • https://nebunabimumebu.weebly.com/uploads/1/3/4/4/134480995/konibu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367645/normal_6022b73fc1701.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404502/normal_5fd87759b7a66.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449965/normal_5fc7ff8378740.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475577/normal_5ff3c470c8ebe.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/mefonevimimix/rotipenapavibo.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/45384890822.pdfIn PDF document text
    • https://s3.amazonaws.com/bamepofewalada/49669495479.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_off00018396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18396 5072 bytes
SHA-256: 754d72e397b7018f6288b566a877b64b7e0fd3c350f6a499e6c4b4aea2677a96
font_01_sfnt_off000194cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194CD 10992 bytes
SHA-256: c882463fbcd6eb3b9865a9953b579878b06dce6473b380a17eec0e49f4a6995f

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