Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa922b2ad8f9aade…

MALICIOUS

PDF

76.9 KB Created: 2021-04-13 18:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b1c9b7b7d11fd93e1a1f92c44b7a733 SHA-1: 199b9741c457f3360b25c2e8290a2af07316bc82 SHA-256: aa922b2ad8f9aadeed83922b193dca48c8c87749ec4d307ce37a210b46e90bfa
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or redirection scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate an attempt to direct users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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
  • 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://ponafet.ru/strik?utm_term=what+does+quantum+physics+tell+us+about+reality
    • https://kekuzisalan.weebly.com/uploads/1/3/0/8/130813403/liwamabupemakexusa.pdf
    • https://cdn.sqhk.co/wanaxowuwot/hciaheZ/ice_age_village_game_hack.pdf
    • https://mitumeme.weebly.com/uploads/1/3/4/8/134879381/xiredinapebel.pdf
    • https://pukakiliratof.weebly.com/uploads/1/3/4/7/134768090/peviguzame.pdf
    • https://cdn.sqhk.co/molewekane/fccU4ia/horizon_blue_cross_blue_shield_omnia_silver.pdf
    • https://jitaginedisa.weebly.com/uploads/1/3/4/3/134324559/e05b81d53677.pdf
    • http://fujudigisegejeb.iblogger.org/biblical_meaning_of_names.pdf
    • https://jepunitapo.weebly.com/uploads/1/3/1/0/131070437/polejogeginifu-gowojifer-rujorexeredawid-fapudanuwosar.pdf
    • https://tirevenisigagum.weebly.com/uploads/1/3/4/5/134500803/lujaxefejofagi_kewinit_xajamugerovixu.pdf
    • https://jerofewu.weebly.com/uploads/1/3/4/3/134369167/zatomul.pdf
    • https://buxijoxusezo.weebly.com/uploads/1/3/1/4/131483018/xexesokasukivege.pdf
    • https://dekewixamime.weebly.com/uploads/1/3/4/5/134516443/3677276.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4f0754e2-f0c4-47db-826b-83042027646c.filesusr.com/ugd/7a11b0_8068176e75244808a83b2c2a64d1e883.pdf?index=true
    • http://mowesod.epizy.com/whos_the_original_singer_of_moon_river.pdf
    • https://d09251a9-b09e-4077-8ccb-24037f005f7b.filesusr.com/ugd/a6ce17_7433838568cf4d71b560b23f2efa393b.pdf?index=true
    • http://perepidowowavam.epizy.com/is_200_basic_incident_command_system_answers.pdf
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_e33caaa00a234b17811ec1aace869855.pdf?index=true
    • http://rufuregebedus.rf.gd/14193232185.pdf
    • http://ferefifadiziv.rf.gd/fasexozu.pdf
    • https://eb72eaa1-ef55-40a3-a653-f6d21bccf295.filesusr.com/ugd/54913d_0a420e9dfebe488f8e5e6b57059cd535.pdf?index=true
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_ce63d5e4223147849eecc3b289494157.pdf?index=true
    • https://e60c805d-b9e1-47fc-b045-983511e9ac1f.filesusr.com/ugd/116bb2_af211d887edf48f9aa136cbda0e89185.pdf?index=true
    • 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_off0000ec9c.bin
96c90f588fb852d551432620a8b833f51ee19287d965deb1593e7bb6f05aadfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9C 5696 bytes
font_01_sfnt_off0000ffe1.bin
80dc51c23444c2070f88b43eda48c820b14304651eb31e2b803290493b02ead4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE1 10676 bytes

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