Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a66ab7d34c15804…

MALICIOUS

PDF

77.0 KB Created: 2021-06-09 16:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 79c691c59c087f2f16e7a02b1cbbcf8c SHA-1: b6a024242b991281bf4691de2a8d0c7777956022 SHA-256: 7a66ab7d34c158048b88ccc7794431afc585ba3cf1427a86c7037c95e7e629b3
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, with a primary focus on directing users to `https://synerhu.ru/pbw`. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an intent to redirect users to malicious content.

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://synerhu.ru/pbw?utm_term=how+to+check+soil+bearing+capacity PDF link annotation
    • https://puzuzabijil.weebly.com/uploads/1/3/2/8/132814257/75a285.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474998/normal_6025043bbc796.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365525/normal_604003bc0a481.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377381/normal_5ff2e33e5246e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384639/normal_606c6f057064d.pdfIn PDF document text
    • https://xewiriwi.weebly.com/uploads/1/3/4/6/134645045/fajix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447884/normal_602452f53862c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463807/normal_6027dd5a2e5f0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gibuwodebu.pbworks.com/f/fundamentals_of_phonetics_5th_edition_free.pdfIn PDF document text
    • http://kugiwetod.pbworks.com/f/cusack_protocol_evidence.pdfIn PDF document text
    • http://zuwofig.pbworks.com/w/file/fetch/144562236/biwezufapejixo.pdfIn PDF document text
    • http://pukagij.pbworks.com/f/93711900638.pdfIn PDF document text
    • http://lururefisu.pbworks.com/f/tabla_de_conversiones_gramos_a_miligramos.pdfIn PDF document text
    • http://fevosezew.pbworks.com/w/file/fetch/144475401/duck_hunt_unblocked_games_66.pdfIn PDF document text
    • http://jininude.pbworks.com/f/beast_esp_apk.pdfIn PDF document text
    • http://fozujedax.pbworks.com/w/file/fetch/144684561/22524732040.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/f/exponential_function_word_problem_with_solution.pdfIn PDF document text
    • http://redejok.pbworks.com/w/file/fetch/144498828/wagivoziwaneved.pdfIn PDF document text
    • http://mupalunava.pbworks.com/w/file/fetch/144572667/what_are_the_5_types_of_figurative_language.pdfIn PDF document text
    • http://fudejob.pbworks.com/w/file/fetch/144504030/non_linear_demand_function_example.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_off0000e886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE886 5556 bytes
SHA-256: 772e6f96983e6d901c1235a8b5ae4f24d6ef69d3a581ff26684687484c72cd9d
font_01_sfnt_off0000fb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7A 12444 bytes
SHA-256: 397b804fbd61d43a133deaf07e144e96356db7aeb4423c23de3a99f927fac239

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