Malicious PDF — malware analysis report

Static analysis result for SHA-256 e44d2b4c23bc3c79…

MALICIOUS

PDF

76.3 KB Created: 2021-03-28 08:28:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0ace4fb1bf17f62b11e8b22a73373c9d SHA-1: 98d9706b1719cc1177ae830e78e84e475f7ef999 SHA-256: e44d2b4c23bc3c79defd619dc5c7c1a346a06ab3ab4d467bd96fd4d0847bf302
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/award?keyword=midodrine+davis+drug+guide+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469863/normal_6028f80d31560.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499653/normal_60582260537dc.pdfIn PDF document text
    • https://cdn.sqhk.co/popuzanuguw/0Q9hbIX/beast_quest_xbox_1_walkthrough.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451930/normal_603d0b8e82361.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391621/normal_5ff2170425dd2.pdfIn PDF document text
    • http://wofurasosezisax.mywebcommunity.org/cambridge_primary_science_learner_s_book_stage_2.pdfIn PDF document text
    • https://cdn.sqhk.co/nemisova/jn2z5D7/melody_thomas_scott_biography.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424997/normal_602260fe704d5.pdfIn PDF document text
    • https://cdn.sqhk.co/fexilejedit/9l5Xred/82611833374.pdfIn PDF document text
    • http://nitapida.mywebcommunity.org/jim_s_weight_training_bodybuilding_workout_plan.pdfIn PDF document text
    • http://dekoriribazovax.mywebcommunity.org/xalisijenabe.pdfIn PDF document text
    • http://bidizujimon.getenjoyment.net/balarama_stories_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jafetegupam/7haiihi/ledaxezomavefuvu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a24bc4ef-4ee2-4fae-af0c-c9fea810b245.filesusr.com/ugd/67d96c_2dfa15fff8f84f0cb18618bd33fbc5c0.pdf?index=trueIn PDF document text
    • https://054d5c26-596f-48a3-87a7-0fc79031e5db.filesusr.com/ugd/599026_8df3f89f248d4f6793f3136a79d86a8a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/govesakozufuwuzoriv.pdfIn PDF document text
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_bcee13b7dd05452db80159d577a8e858.pdf?index=trueIn PDF document text
    • https://f635e5d9-31b1-4f19-b758-7a623be10181.filesusr.com/ugd/6cf0f5_c22558fd06744e6f8e435d324bc61a6f.pdf?index=trueIn PDF document text
    • https://00eaa6b3-f026-4720-b00f-fafb40066352.filesusr.com/ugd/d498be_f6146c2749ba4052a343c8c2443f5127.pdf?index=trueIn PDF document text
    • https://b56e6f12-3f4b-4b75-bc29-9585eb3fba71.filesusr.com/ugd/73f0dd_66a221225a3c4e539eec9c7a241ab605.pdf?index=trueIn PDF document text
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_d8e06f1f921f414db2c64de1198137f3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jiwisi/everquest_leveling_guide_1-_110.pdfIn PDF document text
    • https://s3.amazonaws.com/tosego/dekafa.pdfIn PDF document text
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_4cd1e9f8e0a54b6380575124f840c385.pdf?index=trueIn PDF document text
    • http://segurixuzek.myartsonline.com/dd_3.5_best_druid_spells.pdfIn PDF document text
    • https://8c17aa34-c454-4d6c-a218-8929c845e329.filesusr.com/ugd/808cd0_9859b67f649c44ee9a7b794bd9cf2eeb.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_off0000ec24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC24 5244 bytes
SHA-256: b5a954c3a446d44aa2d0ab114e860fac6dfa1e7bfd1d7472beb4fbaac08f731e
font_01_sfnt_off0000fe20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE20 11108 bytes
SHA-256: ac12cbb07fa163406a4397becc609bc8c3da4368160c884be7f05fcabbf9ad20