Malicious PDF — malware analysis report

Static analysis result for SHA-256 b22c489a60a83812…

MALICIOUS

PDF

110.3 KB Created: 2021-03-23 05:48:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5367445f4562bf6c2011396639f172c SHA-1: 7065cfc0e794cc67e84ac379529e0412e94ff498 SHA-256: b22c489a60a838121a93992fcf374c1cce36c6a337121bf6fde4803e163ace78
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute further malware or phishing content. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/award?keyword=maths+book+for+class+10+pdf
    • http://mitisavad.getenjoyment.net/absorption_costing_and_marginal_costing.pdf
    • https://semoburepov.weebly.com/uploads/1/3/2/8/132815840/3250486.pdf
    • http://ouily.xyz/vabuwiho6a8.pdf
    • https://wuwabisa.weebly.com/uploads/1/3/1/6/131606234/kijexone-pimog.pdf
    • https://wexarasi.weebly.com/uploads/1/3/4/3/134351888/59ab1e35b1b0bd.pdf
    • https://vegekonewipure.weebly.com/uploads/1/3/5/9/135964828/4814406.pdf
    • https://kenomuxi.weebly.com/uploads/1/3/4/0/134042647/bemijalonifik.pdf
    • https://jexujomasok.weebly.com/uploads/1/3/5/3/135343442/roradirefiru-xubaz-vobuguvivo-vubaroxowos.pdf
    • https://cdn.sqhk.co/mepapogivoma/UZhaQgd/rope_ninja_hero_apk.pdf
    • https://cdn.sqhk.co/dutimapo/bibhiib/mirij.pdf
    • http://newipufisatag.scienceontheweb.net/map_of_the_soul_persona_book.pdf
    • http://prizinsta24.space/ipad_pro_12.9_manual62ojb.pdf
    • http://jozipuvuwuzaj.mywebcommunity.org/air_force_academy_application_status.pdf
    • http://zodimasar.mypressonline.com/30355627758.pdf
    • http://pidijajuwupurop.medianewsonline.com/gloomhaven_solo_items.pdf
    • http://towonededuv.medianewsonline.com/avinash_dixit_thinking_strategically.pdf
    • http://kanaxade.mygamesonline.org/how_to_clean_mold_out_of_dr_brown_bottle_warmer.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://jujageritoxo.atwebpages.com/cch_chuyn_t_dng_nh_sang_word.pdf
    • http://gaxilitexu.onlinewebshop.net/penatalaksanaan_bronkopneumonia.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014a4e.bin
fbfc43e76c6c11aa5aa0bd58fbdc349bb2bd702bc8d638ab07eec3e91b3562e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A4E 5164 bytes
font_01_sfnt_off00015be0.bin
31fdbe2e63d05ae90176787cb19d04d7b376de9e47702e104d215f91844f611e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15BE0 13640 bytes
font_02_sfnt_off000187f5.bin
721d98e0a071f5cb47f44dd169bdd121f3bc09ff25bfe3073defc5c8dd19721c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x187F5 16220 bytes
font_03_sfnt_off00019d4e.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19D4E 4324 bytes

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