Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c1dc27ccf1cd884…

MALICIOUS

PDF

83.3 KB Created: 2021-03-21 11:39:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 2d918de5c0ac2949a974d14b4fb8a6ca SHA-1: c438693ffc2f35b31bc73c0a3be4419991af3708 SHA-256: 1c1dc27ccf1cd884206153bc61c014924f1670041879bbf43dcdc023795a899d
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' in one of the URLs further supports a phishing or social engineering lure, disguised as a job application letter.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dugedepap.ru/123?utm_term=teaching+job+application+letter+sample+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368953/normal_5ff466860d531.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420224/normal_5ff9858983ab6.pdfIn PDF document text
    • http://vudifabofugejij.medianewsonline.com/immunization_schedule_in_ghana.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413850/normal_5fffa3c1e8a6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411717/normal_601682ababece.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473039/normal_603acac88686b.pdfIn PDF document text
    • https://gutoxokotuvil.weebly.com/uploads/1/3/1/3/131380594/vufejilal-gubezokafaguro-wizosirixukina-tojisebigasoziv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493873/normal_6029fcc8106d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491445/normal_605111aec69bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374542/normal_5ff4768047713.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459341/normal_60137631005a0.pdfIn PDF document text
    • https://robesiso.weebly.com/uploads/1/3/4/5/134501854/9445423.pdfIn PDF document text
    • http://wijofotezopadik.medianewsonline.com/nizutakonufika.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://guseboses.atwebpages.com/ccna_routing_and_switching_download.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/dudubagodabomagusaxixo.pdfIn PDF document text
    • https://s3.amazonaws.com/dosipive/sijote.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/present_perfect_questions_and_short_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/alfabeto_hebreo_significado.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/56423232129.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_off00010578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10578 5732 bytes
SHA-256: 7be6f769611a679a06a46442bf3aa7c3fcf7b046296761c32b33c91e47c518fe
font_01_sfnt_off000118d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D1 11016 bytes
SHA-256: a32cdea90f70da9c59c18cd9281cb2943d5f12d0cc7d957d4ebaf83b094f64a1

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