Malicious PDF — malware analysis report

Static analysis result for SHA-256 5afd3edb04873792…

MALICIOUS

PDF

73.6 KB Created: 2021-03-04 21:25:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: f1ba4e317aa78dbf8ebc6c10fc22ff52 SHA-1: 3c5c9bc93c116d952371703c4dfa5596b7d212d3 SHA-256: 5afd3edb048737922f144ea34d57f3cb30ac280d821607ce63fc4cbc0cdff15a
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 pointing to disposable domains, suggesting an attempt to redirect users to malicious content or phishing sites. The document body, though heavily obfuscated, contains references to external URLs and appears to be part of a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9772

Heuristics 5

  • 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 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://kuzutuzo.ru/strik?utm_term=what+milestones+should+a+20+month+old+be+doing PDF link annotation
    • http://mazers.fun/the_adventures_of_tom_sawyer_summary_shortko9iq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379731/normal_5fffeb556845b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477637/normal_601e1bcf91e43.pdfIn PDF document text
    • http://sale20.site/nufigomodowukalcdrgk.pdfIn PDF document text
    • http://robolab.one/jakataw6bhy5.pdfIn PDF document text
    • http://opt05.ru/books_by_pastor_chrisescwl.pdfIn PDF document text
    • http://investmag.org/flame_sensor_datasheettmmtb.pdfIn PDF document text
    • http://starkrobotics.org/studio_photography_background_imagesffs0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365599/normal_602e000bb0cad.pdfIn PDF document text
    • http://thehensleys.org/snowglobes_fallout_new_vegas03g06.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450519/normal_5febe585e65ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369336/normal_5fe4b1e0a4a90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419846/normal_600e3749b3964.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_87acefe232134bda8613fd8b4ce52854.pdf?index=trueIn PDF document text
    • https://5c756832-8c1d-4493-8d5e-d81769c2a934.filesusr.com/ugd/2d797c_bf7ce45d39d94207a8b6d030b437a3ca.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a95df93-a86a-469d-8a84-00f97fb06f00/wizageku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbb22c5c-2652-4c17-a63c-c36a2558c020/what_is_the_best_double_oven_electric_range_to_buy.pdfIn 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_off0000ea68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA68 5572 bytes
SHA-256: e55b7d7dc0859d80581d017c22ea5cd51de1ec69e80a24fd2b57b28db374b214
font_01_sfnt_off0000fd37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD37 10896 bytes
SHA-256: a4160df64535d77a5bf2193443ac9659d734e9539656a1c6134ffb1b5113ae28

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