Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91f778568cddce5…

MALICIOUS

PDF

68.0 KB Created: 2021-02-28 07:48:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 97c1564a9c9a28019cff6861b01b0ee2 SHA-1: 4e3c63d29e640e8176ea4dde16bb34b8ee91f524 SHA-256: d91f778568cddce5e8715b1b7b663d798443f572e45e49e433bec7b44483767c
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content or phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a common technique for distributing second-stage payloads or conducting phishing campaigns.

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://mezovuduw.ru/wix?keyword=biological+classification+worksheet+pdf PDF link annotation
    • http://jiteruruw.sportsontheweb.net/conair_clipper_blades.pdfIn PDF document text
    • https://zelubofiwexuf.weebly.com/uploads/1/3/4/2/134234915/2878270.pdfIn PDF document text
    • https://wigewowatabosaz.weebly.com/uploads/1/3/4/3/134352056/6fc0fcccad7.pdfIn PDF document text
    • http://remazage.22web.org/60695432292.pdfIn PDF document text
    • http://steh-sistem.ru/lowes_hiring_in_valdosta_ga5fwyr.pdfIn PDF document text
    • https://fusajebotiv.weebly.com/uploads/1/3/4/3/134320253/sakisejubanuzu.pdfIn PDF document text
    • https://luwujapi.weebly.com/uploads/1/3/4/7/134751522/defesa.pdfIn PDF document text
    • https://zakesulukagog.weebly.com/uploads/1/3/4/4/134493448/zafixuzivope.pdfIn PDF document text
    • http://bagerisevi.scienceontheweb.net/tulilufewumagarapi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://velewetuwo.rf.gd/84397885740.pdfIn PDF document text
    • http://maxegore.epizy.com/74495095743.pdfIn PDF document text
    • http://sokexodine.rf.gd/cash_flow_forecast_template_construction.pdfIn PDF document text
    • http://gevazobi.rf.gd/52009759940.pdfIn PDF document text
    • http://pejezal.rf.gd/check_your_credit_report_experian.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_off0000cd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD25 5624 bytes
SHA-256: d88eaf48dc96df8f993f05988b34117307d6230075c382433a445ffa5399f100
font_01_sfnt_off0000e059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE059 10256 bytes
SHA-256: 857595b1f18e191ec876149da2d743fa129847c3c231be9c3b27b0c7442b69a6

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