Malicious PDF — malware analysis report

Static analysis result for SHA-256 b336e5834e3862e1…

MALICIOUS

PDF

72.0 KB Created: 2021-02-11 23:07:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7b560b59ba016875b19ed7d879c89b68 SHA-1: 7847fd774f3a9413f0d3bd85c64722e0e1b71093 SHA-256: b336e5834e3862e1c6895906dcada90eb049642454d0d1d5029b3dc4225b28ae
196 Risk Score

Malware Insights

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

The file is a PDF that contains a large number of external links, many of which point to other PDFs, suggesting a link farm or a method to distribute malicious content. The ClamAV detection and ML classifier strongly indicate maliciousness. The presence of a password-protected archive lure heuristic suggests the document is designed to trick the user into downloading and opening an archive, which would contain the actual payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://jottigo.ru/wix?keyword=a+good+year+ringtone+iphone PDF link annotation
    • https://puxikatekeji.weebly.com/uploads/1/3/2/6/132681322/wutoporefa-fenikiminebufot-mutumuxawobupew.pdfIn PDF document text
    • https://mijutadozas.weebly.com/uploads/1/3/4/5/134590660/fubaporujadam-jilined.pdfIn PDF document text
    • https://bufujibuku.weebly.com/uploads/1/3/4/8/134862056/d60e1b4e.pdfIn PDF document text
    • https://gibekadizekuni.weebly.com/uploads/1/3/1/4/131452913/1392449.pdfIn PDF document text
    • http://shoppermarket.online/tubolujkf57.pdfIn PDF document text
    • http://tixshopclub.fun/alfabeto_completo_letra_cursiva_e_de_formal4vxf.pdfIn PDF document text
    • http://livecopyrightverification.com/refikafezapd9cz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486199/normal_600d3ef3a1bdd.pdfIn PDF document text
    • http://rfs.team/bitcoin_wallet_blockchainpvotz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489993/normal_6002d96847d32.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/lekezaru/66051925986.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/fusionner_deux_documents_en_un.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/74227243587.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/aleks_math_answers_college_algebra.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_off0000de37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE37 5100 bytes
SHA-256: e5f952e6191ffff7a917605ebc41cee02c53e4e883a2cd081c26ffcb032f6783
font_01_sfnt_off0000ef96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF96 10344 bytes
SHA-256: f5c03544f0d6753902876301b5d47c2eaba882212f4c8af067a5f99e127c1244

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