Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3e76cca67c2a165…

MALICIOUS

PDF

75.9 KB Created: 2021-03-04 21:25:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 932958c5921226f7f0009f7ed1dadccb SHA-1: 2b7c73519cc8b86e1a0b637c2ebe710e65712f32 SHA-256: e3e76cca67c2a165718b27e5886450a9491652d89cc3663fcafedee458e3859b
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 multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document body, though heavily obfuscated, contains references to external URLs, and the PDF structure itself contains a large number of embedded links pointing to various domains, many of which are associated with disposable hosting. This suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

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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