Malicious PDF — malware analysis report

Static analysis result for SHA-256 12d8731a0301900e…

MALICIOUS

PDF

77.2 KB Created: 2021-05-01 11:36:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e98d2b1935f51f061e44e431c079d359 SHA-1: 91b7bd2d9ca1db7ac055472b51062d0084bda4be SHA-256: 12d8731a0301900ebaf33da6d9c8baef44a4be1b37972a9a676c24ebf4ddaad5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://xezojetit.ru/strik?utm_term=csn+english+101+course+description PDF link annotation
    • https://mafenipo.weebly.com/uploads/1/3/4/8/134879688/6142435.pdfIn PDF document text
    • http://goproits.com/error_hp_officejet_pro_8610nn0ti.pdfIn PDF document text
    • http://xukejufivakege.iblogger.org/sector_and_arc_length_worksheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421039/normal_604e2fceaf3c6.pdfIn PDF document text
    • http://gagogepatajebe.medianewsonline.com/calculus_example_problems_with_solutions.pdfIn PDF document text
    • http://xemizawufogutuf.scienceontheweb.net/what_is_the_concept_of_sustainable_human_development.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365563/normal_5fd3a0fd11200.pdfIn PDF document text
    • http://gixapedotamerow.mywebcommunity.org/behavioral_portfolio_theory.pdfIn PDF document text
    • http://lamomusexosefe.66ghz.com/budismo_zen_y_psicoanalisis_fromm.pdfIn PDF document text
    • http://fekosuse.getenjoyment.net/kududedem.pdfIn PDF document text
    • https://pexigupor.weebly.com/uploads/1/3/4/9/134901766/xirabodu_nebakururotos_gerusafas_gezuban.pdfIn PDF document text
    • http://norikaloro.mywebcommunity.org/tevukovazarujamuf.pdfIn PDF document text
    • http://pop-marketplace.ru/through_the_wormhole_with_morgan_freeman_full_episodes0rzcq.pdfIn PDF document text
    • http://woxagaxizi.22web.org/anatomy_of_human_digestive_system.pdfIn PDF document text
    • http://opt15.ru/vitavifigakusaposisaxftts.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425492/normal_5fe00403675a9.pdfIn PDF document text
    • http://qiwi-wallet.online/51735942687em08w.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xirexadugimog.atwebpages.com/zafimowunusaxabobapeso.pdfIn PDF document text
    • http://padizidegenul.rf.gd/gulujuwesuvijad.pdfIn PDF document text
    • http://pakapenabu.atwebpages.com/diziler_soru_zmleri.pdfIn 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_off0000ed33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED33 5224 bytes
SHA-256: bd9c57e2d386ccabe718256f6e65eb75cd4bf84dfa2ceaaa751ce10a8b19dfac
font_01_sfnt_off0000fef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF5 12120 bytes
SHA-256: d6f4c6cce5d3dc9e5b06dfa36bc421acc3c9db034ee0e1948eee41c0adff1e6f

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