Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7a625e3b56091ad…

MALICIOUS

PDF

76.8 KB Created: 2020-12-31 06:48:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: f51a8baabe6444312cebc91ad74e9339 SHA-1: d2c2a63b8c47d95ca97e40cb0f975fbc8b494bdc SHA-256: b7a625e3b56091adee452ac11f4ed37bf838c5f491d94999776f9d2b38a5afcb
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to numerous external PDF files hosted on disposable domains, likely to obscure the ultimate malicious destination. The presence of external URIs and a link farm suggests an attempt to distribute further malicious content or phish for credentials.

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.
  • 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://trafffi.ru/strik?utm_term=jyotipunja+smart+app+download PDF link annotation
    • https://lozukiwilef.weebly.com/uploads/1/3/4/6/134644014/lozizuvav-jotuwoxemaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458421/normal_5fecd582b8476.pdfIn PDF document text
    • https://kotugelofamoxu.weebly.com/uploads/1/3/4/4/134403640/41a52dfdf8.pdfIn PDF document text
    • https://ganubosi.weebly.com/uploads/1/3/4/5/134506756/bisixam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408186/normal_5fe82f9af00af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466689/normal_5fa976fb983d0.pdfIn PDF document text
    • https://litulivugaz.weebly.com/uploads/1/3/4/4/134463412/tetixudenamo-vutegu.pdfIn PDF document text
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/ea99eee.pdfIn PDF document text
    • https://birivuben.weebly.com/uploads/1/3/4/6/134618962/zadamudexokokop-xewevewejital-razewebodabilal.pdfIn PDF document text
    • https://dagevonedil.weebly.com/uploads/1/3/4/7/134736192/2871e2b6.pdfIn PDF document text
    • https://vunisanelebori.weebly.com/uploads/1/3/3/9/133999195/pefewepa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379605/normal_5fe229af7414a.pdfIn PDF document text
    • https://dolevepi.weebly.com/uploads/1/3/4/5/134587457/412892.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/30a199f2-26a5-4991-bf96-83dbff2cb772/advanced_financial_accounting_textbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a89761e7-d74a-4a75-9115-13e08a5fc9f4/swan_meaning_urban_dictionary.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_off0000ef98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF98 5364 bytes
SHA-256: ea84e2e12d9b76e481ff1929b3274060c63ba5351812a2479c9fd533a5440109
font_01_sfnt_off000101d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D9 10696 bytes
SHA-256: 7736087db73edcfe5db5c0a86ae5340fddbc53a193f7af18d1dac05daae3b78b

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