Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b35dd8272f813bd…

MALICIOUS

PDF

87.0 KB Created: 2021-03-21 07:49:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 916b5931c5cb5b7191a001ecd1d9570b SHA-1: 2a40ddd8bb0a5bfb8835f5fd930d071777e0a86f SHA-256: 8b35dd8272f813bd91b35ba3a428aeef1df76f14559a54dab9eab519b7163c92
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to 'xezojetit.ru', suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing a secondary payload. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/123?utm_term=digital+marketing+strategy+template+word
    • https://tidukunetubuf.weebly.com/uploads/1/3/2/7/132710673/909281.pdf
    • https://ziresaro.weebly.com/uploads/1/3/4/5/134509830/terajofevibasupojo.pdf
    • https://cdn-cms.f-static.net/uploads/4368468/normal_5fea0a5e9622e.pdf
    • https://cdn-cms.f-static.net/uploads/4382187/normal_601baf43923d2.pdf
    • http://wgathering.org/whats_different_in_fifty_shades_darker_unrated9hjeo.pdf
    • https://bulipegorevuju.weebly.com/uploads/1/3/4/7/134700868/vaduz_susuxik_bizatuzane_jenodesukexi.pdf
    • https://cdn-cms.f-static.net/uploads/4500440/normal_604691b2d5fda.pdf
    • https://cdn-cms.f-static.net/uploads/4418197/normal_6011928624e6f.pdf
    • https://static.s123-cdn-static.com/uploads/4382197/normal_60039296546cd.pdf
    • http://100p-f.ru/asu_parking_map_poly3hvxc.pdf
    • http://takipleskazan.org/49690215383snll1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_3a317e465bce45aabc7f7b43a6fd2ed0.pdf?index=true
    • https://73856814-13bb-4d44-aeaf-752cce6ba6bd.filesusr.com/ugd/a0d21a_1716030ba46d4ecfb0076a4b455f09a2.pdf?index=true
    • https://s3.amazonaws.com/numunenoji/american_gods_season_1_full_episodes.pdf
    • https://s3.amazonaws.com/zoromexemuzid/why_was_rise_of_the_skywalker_bad.pdf
    • https://s3.amazonaws.com/wupiwupiwot/footprints_without_feet_question_answers_ncert.pdf
    • https://s3.amazonaws.com/pukaridimupo/pewobegiberopelovikuw.pdf
    • https://s3.amazonaws.com/tezofuretejom/manually_upgrade_windows_10_1803_to_1809.pdf
    • https://s3.amazonaws.com/tibanepoxilibud/49389813411.pdf
    • https://6fd4412c-3e6e-4f21-a9af-8137ffc6c0d9.filesusr.com/ugd/03469c_fb630a86744347629e2ba1937cfb0cd1.pdf?index=true
    • https://s3.amazonaws.com/dupula/free_movie_diary_of_a_wimpy_kid_the_long_haul.pdf
    • https://s3.amazonaws.com/bipepezuwed/wallpaper_for_iphone_5s_free.pdf
    • https://s3.amazonaws.com/widofafane/64946347408.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116ba.bin
ff3e3a328203588b6f3b60294399cbf0d4f25989faf86f8811f170a4db399748		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116BA 5536 bytes
font_01_sfnt_off0001299a.bin
f17a05392c8f30c2280ef7f9eae23c1aa9e9d96f21c5c5253c7125c7a8688bdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1299A 10888 bytes

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