Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b1fc49344ef4137…

MALICIOUS

PDF

69.9 KB Created: 2021-04-02 16:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9ad224ac103dc1b63d4f6461388d5b88 SHA-1: da25ded9369f947c50bb1359240d7ab14f9af079 SHA-256: 9b1fc49344ef41377ff392fec25397c1b83dab188937b287e7edf249d985d8c6
186 Risk Score

Malware Insights

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

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 0.9991

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://jumiwimov.ru/wix?keyword=avesis+dental+provider+list PDF link annotation
    • http://centerbluebadge.com/jigorevhmafx.pdfIn PDF document text
    • https://zodosibuje.weebly.com/uploads/1/3/1/0/131070625/kilasozolat.pdfIn PDF document text
    • http://topstudy.fun/android_music_offline3v0zm.pdfIn PDF document text
    • http://3bki.ru/sports_event_management_systemvtw6i.pdfIn PDF document text
    • http://pe50off.info/bivitekoselirimurgt2a4.pdfIn PDF document text
    • http://littlenat.space/fidilojezusadp48jr.pdfIn PDF document text
    • http://jezojarugeboz.22web.org/karuppusamy_kuthagaitharar_tamil_song.pdfIn PDF document text
    • http://mainsale.pro/74398172594ig4a8.pdfIn PDF document text
    • http://lnstagramservicecopyrights.com/mukumoligigemogaluqalvc.pdfIn PDF document text
    • https://fowinojosusine.weebly.com/uploads/1/3/4/4/134495991/naruzikiponififev.pdfIn PDF document text
    • http://tryadasert.online/667926542766lwld.pdfIn PDF document text
    • http://nashremont.site/85926490495857bj.pdfIn PDF document text
    • https://rapofureduf.weebly.com/uploads/1/3/1/1/131164295/dinosevabosexugubuzo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vegobojogaroju.rf.gd/73180120140.pdfIn PDF document text
    • http://vonimamodiji.rf.gd/1938829490.pdfIn PDF document text
    • http://vutitogox.epizy.com/birbal_stories_in_telugu.pdfIn PDF document text
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_586b34fcee054a2280a8e951b069fda1.pdf?index=trueIn PDF document text
    • http://derajovaku.rf.gd/66029028031.pdfIn PDF document text
    • https://e1bd05e7-a2ed-43df-b5fc-9bc8ee0b1a84.filesusr.com/ugd/08acf3_876cb59aeed647c6a20157041f25778e.pdf?index=trueIn PDF document text
    • https://a98f38e8-5810-4fc9-be6a-c3d78c7c4f9f.filesusr.com/ugd/921909_7be71efba1c94a16b22264bd144faa5a.pdf?index=trueIn PDF document text
    • http://penalat.rf.gd/jewish_new_testament_david_stern_online.pdfIn PDF document text
    • http://ratazudawi.epizy.com/uniformly_accelerated_motion_velocity_time_graph.pdfIn PDF document text
    • https://cf587a47-7c2f-4f55-8bbb-21a4c73503f7.filesusr.com/ugd/8ea597_1bca03e0a0914bcb83ddf5fafb4eb5f4.pdf?index=trueIn PDF document text
    • https://cd29ef07-728f-4a0b-b57b-23e770395c36.filesusr.com/ugd/f14cf6_1175bd54ef0d42a1ac0d7510429b22b5.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_off0000d365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD365 5000 bytes
SHA-256: 638006020b5129bf5fa6e010f6a7724b1f968608f61196246855024af4aef965
font_01_sfnt_off0000e47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47C 11156 bytes
SHA-256: 5e2e74ec23f4e1db3bbed3bad449824103fd386c3310fa5860262cec7922f624

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