Malicious PDF — malware analysis report

Static analysis result for SHA-256 c313cd1d89b9cdd6…

MALICIOUS

PDF

75.7 KB Created: 2021-05-09 00:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 7dbc4650b39b66c496025c53ac3bd6f1 SHA-1: 2282483132aa6aa5869c7f723d62069c49825cdf SHA-256: c313cd1d89b9cdd67cc9fc07bf8311d629dcb313f439dd809e7dcfb268c3049a
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The primary external URL, 'https://baarspo.ru/strik?utm_term=can+i+join+the+army+reserve+at+35+years+old', appears to be a redirector. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to drive traffic to malicious or deceptive websites, consistent with phishing or scam lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://baarspo.ru/strik?utm_term=can+i+join+the+army+reserve+at+35+years+old PDF link annotation
    • http://lozuzaragujeb.mypressonline.com/acid_alkaline_food_chart.pdfIn PDF document text
    • https://cdn.sqhk.co/nanagajog/gihhjjb/centipede_game_console_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/zoburawava/hSljhjd/zejelodiwulizoberesaviter.pdfIn PDF document text
    • http://niwopofe.scienceontheweb.net/78037529941.pdfIn PDF document text
    • http://mybestchan.online/vowesa5varv.pdfIn PDF document text
    • http://neyroskakalka.site/nilafogucs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kivozusemu.atwebpages.com/rheem_gas_furnace_prices.pdfIn PDF document text
    • https://ed0f7819-48b4-4c0d-9119-93de03d81b9c.filesusr.com/ugd/e481ce_de0919d433184641bef882f507016a63.pdf?index=trueIn PDF document text
    • http://foridifakusexum.rf.gd/shark_vac_then_steam_mop_troubleshooting.pdfIn PDF document text
    • http://gofosuxubajo.epizy.com/arch_formers_travis_perkins.pdfIn PDF document text
    • https://e6c529cc-411f-4195-b5ea-7b5fd081490a.filesusr.com/ugd/b7ab08_ee78cbbb3ea64bf5a521401899b19048.pdf?index=trueIn PDF document text
    • http://vidugozu.atwebpages.com/kitchenaid_mixer_repair_shop_near_me.pdfIn PDF document text
    • https://8d67285a-e3c5-4820-bb1a-bb91ce1079a6.filesusr.com/ugd/d54300_9881a74a95824b6abb140afcfc2dd838.pdf?index=trueIn PDF document text
    • https://e6676b24-921d-4f57-8fca-beda98688f3c.filesusr.com/ugd/144d27_973a8fafed0c42458c124302296afc07.pdf?index=trueIn PDF document text
    • https://f3874c2d-c116-49c2-b7b6-9300dc8fc43e.filesusr.com/ugd/b11f6d_b8bc5046f0bd46c491e4dff694a41ab2.pdf?index=trueIn PDF document text
    • https://2e03c77f-99cc-4591-9807-54d8d49c9ce6.filesusr.com/ugd/759733_f67bfc271ab349f6b138039cb71351e6.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_off0000e78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78A 5496 bytes
SHA-256: 1c6994bfad69524f3eacf2b755be55f8fc9039adac06a14b6a233c8a3b13ba8b
font_01_sfnt_off0000fa1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1A 11068 bytes
SHA-256: 200ffdfbf37c4d552af3af5367471494f0803b437a6606e7f5debb61c4a3fe7e

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