Malicious PDF — malware analysis report

Static analysis result for SHA-256 1df81f54e559a3a3…

MALICIOUS

PDF

71.7 KB Created: 2021-03-16 01:28:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 41cf9552ffbdb59735be0ae8296a5d90 SHA-1: a8fcf0de6a952e4cc4594ef9918fd4a80763a2b1 SHA-256: 1df81f54e559a3a3e239fb452742c133ba00ddd0a68041d75404ab12be14e8e7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting and link farms, suggesting an attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy to obscure the true destination by using multiple domains and SEO-related keywords.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/wix?keyword=marshfield+youth+sports PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4385197/normal_5ff6970c928ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459177/normal_5fed1ca6bc59f.pdfIn PDF document text
    • http://raxejudesezix.scienceontheweb.net/how_to_help_healing_after_c_section.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378836/normal_603c13f39d84a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498324/normal_5fcaf0250a590.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368991/normal_5fd7dce68e054.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496402/normal_5fc835a11ba1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409244/normal_6036b425d1928.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457590/normal_601b378bd53dd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7f793f8f-877f-420e-851b-8bae9ea62a4d.filesusr.com/ugd/78c764_be434b1a5f1c4bbe9fead0eea41b48c4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/falevi/75517396021.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/69178188836.pdfIn PDF document text
    • http://zorijefugixor.atwebpages.com/19033571501.pdfIn PDF document text
    • http://tiwosutodegadax.onlinewebshop.net/amba_shambhavi_lyrics_in_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/67348386443.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/what_is_stress_concentration_factor_kt.pdfIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_bea56e6706e947abb17d54701027fe5d.pdf?index=trueIn PDF document text
    • http://gosaduzunake.myartsonline.com/13763687467.pdfIn PDF document text
    • https://f733e552-90a1-4d1f-83ca-a6b36afcf31c.filesusr.com/ugd/38bf1f_61cdf118077e4326b26a98641132d4ec.pdf?index=trueIn PDF document text
    • https://d2faa26e-66ca-44cd-8f84-883624a71019.filesusr.com/ugd/dbbfd0_b0a54812673942cab2cffce79cb2648f.pdf?index=trueIn PDF document text
    • https://9a1eab6f-da2d-4a41-99bb-18a59f11b130.filesusr.com/ugd/c2b690_bfb686bf8a5a44b3ab7fd790a5fe61dd.pdf?index=trueIn 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_off0000d95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95E 5236 bytes
SHA-256: 4af6fbc8d831251e982ed566713f24b66c7654d08f78793bdf337dc0588ad773
font_01_sfnt_off0000eb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3C 11432 bytes
SHA-256: 73957d90483b3d4bd38e8c7f05336eb16c3e9f165dbcd4a8765563dceb88c41a

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