Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad5985f604507872…

MALICIOUS

PDF

75.1 KB Created: 2021-01-20 17:07:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 36f89e72e75ea497e21adee17e336466 SHA-1: ede48063bfe3810c0666c7aff7cc7560ad8d4b36 SHA-256: ad5985f604507872187dbae43e545b2803a428bd762f8fc96680c36edbd85bc4
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting and redirector services, indicating a link farm or phishing campaign. The presence of a malicious redirector URL and a critical ClamAV detection strongly suggests malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malicious redirection attack, likely delivered as a spearphishing attachment.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=motorcycle+wheel+balancer+near+me In PDF document text
    • https://site-1206084.mozfiles.com/files/1206084/easy_moist_chocolate_cake_recipe_with_oil.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxarogajib/gp5r3bl/gikux.pdfIn PDF document text
    • https://cdn.sqhk.co/joraxeneli/7NhhhaB/68719911062.pdfIn PDF document text
    • https://site-1175421.mozfiles.com/files/1175421/body_builder_photo_hd.pdfIn PDF document text
    • https://botiwugagow.weebly.com/uploads/1/3/1/8/131872238/528575.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419437/normal_5fbf1125425b9.pdfIn PDF document text
    • https://site-1176351.mozfiles.com/files/1176351/47036336829.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404750/normal_5fd18c9ab3ec1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421780/normal_5f9800e741ff0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417670/normal_5fac243aac2f0.pdfIn PDF document text
    • https://site-1235418.mozfiles.com/files/1235418/cardinal_newman_catholic_school_uniform.pdfIn PDF document text
    • https://finolija.weebly.com/uploads/1/3/4/6/134625313/9f89e722792.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369796/normal_5fee537ac9a97.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://koxaxinum.epizy.com/ilford_fp4_4x5_100_sheets.pdfIn PDF document text
    • http://wafogaz.rf.gd/best_cv_templates_2019_word.pdfIn PDF document text
    • http://sogulonogob.epizy.com/angular_7_formdata_empty.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_off0000e80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80F 5200 bytes
SHA-256: a7d520ce4eecec0984f55df3fff59e07ea93214194201cda8050d6bdf6c67603
font_01_sfnt_off0000f9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B6 11000 bytes
SHA-256: 6c00788ed8281238e2e5deebb5057644464bb7d3bcf0cc9ed2bd12d320c9cdd7

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