Malicious PDF — malware analysis report

Static analysis result for SHA-256 f484e87caa775cac…

MALICIOUS

PDF

109.8 KB Created: 2021-03-01 16:29:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 27c9a4b6282402abd16c35173e40462c SHA-1: d8bbb8c3ea47ce98bed4e8bda7bb01616bc7affe SHA-256: f484e87caa775cac39cf4d23331a7bcb1e8e4ec7e2abe6fa439abac2dc20c356
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/award?keyword=who+plays+the+master+of+the+house+in+les+miserables PDF link annotation
    • https://zusonugen.weebly.com/uploads/1/3/5/3/135305237/72df5e.pdfIn PDF document text
    • https://kofudavobew.weebly.com/uploads/1/3/4/6/134602163/9bdfeba.pdfIn PDF document text
    • https://jesisime.weebly.com/uploads/1/3/4/8/134886507/5714626.pdfIn PDF document text
    • https://bilujadaju.weebly.com/uploads/1/3/4/7/134772480/1217312.pdfIn PDF document text
    • https://dubonizu.weebly.com/uploads/1/3/1/6/131606556/9203537.pdfIn PDF document text
    • https://peruvapi.weebly.com/uploads/1/3/0/8/130813059/gasij-suzodudok.pdfIn PDF document text
    • https://ruwatija.weebly.com/uploads/1/3/4/8/134846771/vumisorixerumeb.pdfIn PDF document text
    • https://bativazuwa.weebly.com/uploads/1/3/0/9/130969541/lanas.pdfIn PDF document text
    • https://bubokadorododu.weebly.com/uploads/1/3/4/7/134758236/4258442.pdfIn PDF document text
    • http://omynutural.space/rarilipuslj80z.pdfIn PDF document text
    • http://phrensy.co/bloody_roar_primal_fury_ps2nn96z.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuletesowugi.epizy.com/how_to_put_arris_tg1672g_in_bridge_mode.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ECF 5396 bytes
SHA-256: ba79945c7d264cf4999b9906153faf6d9434f9b34f4a729ac100eab579e4c0e5
font_01_sfnt_off0001710d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1710D 10212 bytes
SHA-256: 897dfb9d9384e949cf9834f19ab3a300bea46b5297a8e3c55a8253149533cb3e
font_02_sfnt_off00019432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19432 16120 bytes
SHA-256: 15a68420f1c377824b8c1fd571ac7c30556db1b4bc05006bf44ec3f6c6c83208

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