Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e384025c4fa4cb8…

MALICIOUS

PDF

77.8 KB Created: 2021-04-11 03:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 45299d82141c478fe3a74b2060756f84 SHA-1: 64cbbcbb76367dad03228730181005da94f12c62 SHA-256: 4e384025c4fa4cb83341dc182d880ccb5290568e1b96b692ab89f838f3d0220a
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a high number of embedded URLs, many pointing to disposable domains and link farms, indicating a malicious intent to redirect users. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the sheer volume of suspicious links suggests a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://golowaki.ru/strik?utm_term=identidades+trigonometricas+fundamentales+formulas PDF link annotation
    • http://tiktokhd.design/6303994611716rxu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371523/normal_5fd06fe03b080.pdfIn PDF document text
    • https://mawenevemubazu.weebly.com/uploads/1/3/4/4/134402841/dfa79650c17c.pdfIn PDF document text
    • https://japiravonasuv.weebly.com/uploads/1/3/4/6/134644749/2669489.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484806/normal_60609da070390.pdfIn PDF document text
    • https://sinekagu.weebly.com/uploads/1/3/4/8/134855021/kufageluz.pdfIn PDF document text
    • https://cdn.sqhk.co/lozuzupadis/gdhe8Sa/5_seconds_of_summer_ages_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471996/normal_6047c5c5271b4.pdfIn PDF document text
    • http://busibear.com/tusamevatajudifetanuf50cbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449187/normal_603e65a9906d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461207/normal_600a53036cba5.pdfIn PDF document text
    • http://help-feedback-amzn3.xyz/silubako9n70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418567/normal_606a2c071d126.pdfIn PDF document text
    • http://cosmeteca.com/nubanazumiosgyc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372740/normal_5ff9fc28da538.pdfIn PDF document text
    • https://cdn.sqhk.co/zodavujera/hbgeq7w/60251712150.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411931/normal_5ff56b2e4d69a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fedure/37031655153.pdfIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/worosanadoxuwidukizilen.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/honda_3000_generator_maintenance.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/zolabukesenidejulol.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_off0000f1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B7 5276 bytes
SHA-256: d614ff5ddb1d8e7c8db1ca66b47b1265193d4ea26e3d8353313b459dae2cc579
font_01_sfnt_off00010394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10394 11012 bytes
SHA-256: 56570eb465010524318b7a51fc21d631b29f1aec60cfd5bcb3b43e372ee06981

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