Malicious PDF — malware analysis report

Static analysis result for SHA-256 36493147cf574cac…

MALICIOUS

PDF

66.6 KB Created: 2020-12-11 08:10:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 19427bb82457bce54bbbbb7b679bc9e6 SHA-1: d5b8830e635dbfff24a1bf103ff6d15d4229dbcd SHA-256: 36493147cf574cac9958b2e276bee02a2d6dc0ec74b93e03fed443c2de099ba5
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a phishing or malware distribution vector. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient evidence for a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://trafficel.ru/strik?utm_term=the+flash+theme+song+lyrics PDF link annotation
    • https://kumapeforurimo.weebly.com/uploads/1/3/4/6/134664671/7832987.pdfIn PDF document text
    • https://nilesezijifata.weebly.com/uploads/1/3/4/8/134885493/5400782.pdfIn PDF document text
    • https://penuwepilaxol.weebly.com/uploads/1/3/4/7/134756509/xajijovejabowu.pdfIn PDF document text
    • https://sabopedawexidix.weebly.com/uploads/1/3/4/3/134305122/wubozimipibaroxun.pdfIn PDF document text
    • https://rijizego.weebly.com/uploads/1/3/0/7/130776487/4286658.pdfIn PDF document text
    • https://gobitinu.weebly.com/uploads/1/3/4/9/134902795/ziwivafuj.pdfIn PDF document text
    • https://gewosawoma.weebly.com/uploads/1/3/0/7/130739201/ledemafo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc7185a5fa98a681f0c9b59/t/5fcdae4e83d2ac65cc30f3bb/1607315022997/53845539411.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/cysteamine_cream.pdfIn PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/boraj.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_off0000c5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DE 5348 bytes
SHA-256: 26adbf1026179003dc8dec6ecc4b78e2ffa39f5fac245398ff39d6da38f84378
font_01_sfnt_off0000d7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EF 11272 bytes
SHA-256: d7758fde5ca1da221ab2e26629be5b74158cd487036195839ca34fae8d940c31

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