Malicious PDF — malware analysis report

Static analysis result for SHA-256 f37cb45643a61d92…

MALICIOUS

PDF

83.2 KB Created: 2021-03-24 07:17:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a284cadd4d79984b35f57f60c406b1d7 SHA-1: 22a6b64e4f3b9333d531223ab47a2613038c4e87 SHA-256: f37cb45643a61d92bd75cbd9986d91c7c17be2530da0892e95e4ba42677e6c44
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 SEO spam operation. One prominent URL is https://gimoguvi.ru/strik?utm_term=the+crucible+act+3+quiz+questions+and+answers, which appears to be the primary lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-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://gimoguvi.ru/strik?utm_term=the+crucible+act+3+quiz+questions+and+answers
    • https://baxomowimesadud.weebly.com/uploads/1/3/5/3/135303612/3d1a7f6.pdf
    • http://pixxel.life/pilemipovugakusoxe7hj5p.pdf
    • http://doxalasi.mywebcommunity.org/the_boy_who_harnessed_the_wind_worksheet.pdf
    • https://vonepegoparopew.weebly.com/uploads/1/3/4/3/134352316/zaxuvadapagukib-tadudejedi.pdf
    • http://vnds-super.space/twilight_saga_collection_booksj0t60.pdf
    • https://bunupujitoj.weebly.com/uploads/1/3/4/0/134017728/luwokabusisuv.pdf
    • https://wuzusujozibavil.weebly.com/uploads/1/3/4/6/134689519/2139526.pdf
    • https://kiwazavu.weebly.com/uploads/1/3/0/7/130776346/vipagivewoduwijuk.pdf
    • http://itwomen.space/golan_farmacologia_espaolss7y7.pdf
    • http://zozavelomidabi.scienceontheweb.net/best_free_daws_2019.pdf
    • http://virivuluk.getenjoyment.net/24342737515.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_ce154cb252db488093bcbdd76eb20389.pdf?index=true
    • https://b64dd490-e5b9-492f-89ff-e398ecee904c.filesusr.com/ugd/5926b4_db7f2f1d0c4245f5bf5bf6393cb2934b.pdf?index=true
    • https://a0f1d9c0-ea46-4e0e-9383-d87711d3127f.filesusr.com/ugd/1e3fb7_327458c15c384955bdeb3a38931717c1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/271db496-57ca-427c-89e9-1f77e4210075/asta_loses_his_grimoire.pdf
    • https://79d86aa2-23c4-4aa0-a0dc-c16ac59ae55d.filesusr.com/ugd/ecb701_86664c51b9634f8683409cbe80f3d5f0.pdf?index=true
    • http://dokudaruriwiv.atwebpages.com/rakojak.pdf
    • https://83d7d1d1-3661-4158-a2cc-78aa4aa39d08.filesusr.com/ugd/163759_59c955e29ed046f38cc8da97a12982a9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/188f0ba3-120d-4e76-a9bf-fb73b70b9ef8/bose_acoustimass_10_series_v.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f93d.bin
33af63b8e83ec695900c79e21e2c12e5c2bbaebb7a5bc921d567ec073b463fe9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF93D 5428 bytes
font_01_sfnt_off00010bb6.bin
cd70d07c667f80e548613837e57e38e8c3764c02a370d4419c16b530418f2441		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB6 10968 bytes
font_02_sfnt_off000130d2.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130D2 4324 bytes

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