Malicious PDF — malware analysis report

Static analysis result for SHA-256 e38587cbe120cd22…

MALICIOUS

PDF

80.9 KB Created: 2021-06-09 16:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 09c2f88e4d441fae1e16f39c653ceffc SHA-1: d050ed756f446d8a05b38063151223f7d9c01356 SHA-256: e38587cbe120cd22d244847ba60a2724fa8f92989144d1c9a709fb3a6490e20f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with a primary focus on directing users to a link farm hosted on zajinet.ru. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's purpose is to manipulate search engine results or distribute further malicious content through a network of disposable hosting sites. No scripts were extracted, but the presence of external URIs and the link farm heuristic strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/123?utm_term=class+6+english+lesson+10+question+answer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417645/normal_605a911f6819d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366662/normal_5ffbbc7fdabf2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500201/normal_603d09cc32926.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446642/normal_60307bbf59f05.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385859/normal_5ff8d7204c3c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489853/normal_6068c68be8a3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485587/normal_600eae6059463.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370267/normal_6010cfa29c87c.pdfIn PDF document text
    • https://xesizoge.weebly.com/uploads/1/3/1/4/131452949/f4560363cea.pdfIn PDF document text
    • https://lenukanaferu.weebly.com/uploads/1/3/0/8/130873899/javumede-burafarujedixo-kapolotexomuku-nojudivigina.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500670/normal_5ff9f418bbe97.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kiletejude.pbworks.com/w/file/fetch/144425703/simple_request_letter_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f519ce06-1b79-44ae-a3d3-c140a115a93c/star_wars_comics_reading_order_dark_horse.pdfIn PDF document text
    • http://wojipag.pbworks.com/f/tusewewikozedowa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e54e6cdc-887b-4393-a575-d85fab51a470/hp_6700_paper_feed_problem.pdfIn PDF document text
    • http://palixazoke.pbworks.com/f/husqvarna_455_rancher_chainsaw_service_repair_workshop_manual.pdfIn PDF document text
    • http://luwapoveduvi.pbworks.com/w/file/fetch/144486411/service_manual_volvo_s80_2001.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b302e88-2ab7-4384-be5d-656c26161ad0/12777773073.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_off0000fe40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE40 5420 bytes
SHA-256: d3e87e24e3023552093a88c07bd0da2687e73cb95ca9ca906e564fc485efec9e
font_01_sfnt_off000110b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B4 10964 bytes
SHA-256: d1b9820767d4da6a6011e060214925be466b8d1127b664e657ccb26d46975dee

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