Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b622247d60ea7c7…

MALICIOUS

PDF

77.0 KB Created: 2021-04-20 00:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 11401a7e7163ce709bd374272571fe0a SHA-1: b6109779d392733a908bd96f3eb3bd265747ab54 SHA-256: 0b622247d60ea7c759823ecfa08a4a47384c48f3b3e5e6e79317b78f03935a66
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, with one identified as a potential malicious URL (zajinet.ru). The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm, a common tactic for SEO manipulation or distributing malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this file. No scripts were extracted, but the presence of numerous external links suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • 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://zajinet.ru/strik?utm_term=polly+pocket+race+track PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4503874/normal_5fd198bfa9ccc.pdfIn PDF document text
    • https://cdn.sqhk.co/bujasugawo/Ghfbif3/38955626698.pdfIn PDF document text
    • https://cdn.sqhk.co/tirabipati/0hbichh/social_media_marketing_strategy_template_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/bozadukopufu/bjgQhih/10445305341.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450421/normal_6034012dda6cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380883/normal_602d698e65ef7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492600/normal_601d9eda07ff4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458618/normal_5fe1bf27a7878.pdfIn PDF document text
    • https://cdn.sqhk.co/depifozopupe/hi2C0jf/gwent_the_witcher_card_game_best_nilfgaard_deck.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://156bb51f-0b62-477f-88ca-8620af00812b.filesusr.com/ugd/e3ff21_9ee369be1c1c4e07a5b1ac05b62a7d6e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/remufuzu/hd_movie_hollywood_new.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/70267741786.pdfIn PDF document text
    • https://a96990da-dd17-4b11-844c-aba2d588d1b6.filesusr.com/ugd/5e5e7b_9499628f7f8843b8b8eb2421c4589d80.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gitipelut/additional_synonym_formal.pdfIn PDF document text
    • https://bed2d873-735b-46bb-a8a3-264d0455df4e.filesusr.com/ugd/03ede2_b5df54e80d38469d98bc6fd5f07897f8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/43171905975.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/27000520467.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/lisumirapikixapugeka.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/what_age_is_outlander_book_appropriate_for.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/why_does_my_power_washer_lost_pressure.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/yorcia_alluvion_skirmish_guide.pdfIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_e1635336af714879b324204b2c61f2b5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/altec_lansing_life_jacket_specs.pdfIn PDF document text
    • https://e9593579-f51f-4dc6-af55-2543ab512b45.filesusr.com/ugd/37952c_3ee6adf922ad4b7486d4ff86c30b163c.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_off0000f240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF240 4916 bytes
SHA-256: 6369d3655142e5fae41c1168cf877d7edd7a4eefd342198969d8c131ec527999
font_01_sfnt_off00010311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10311 10392 bytes
SHA-256: caf06034b87ff948372dfb0446cd993eacf2f8f40b1c5133ec1e5dd013ac358e

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