Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6e5a4d2690902fe…

MALICIOUS

PDF

75.6 KB Created: 2021-05-12 23:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: aba907a503e114bdc775be564922a5db SHA-1: 87f54c874fb190ed89ab8a0da8220d4591262d6e SHA-256: b6e5a4d2690902fecae4f14e840b3a9bb9ee4482950dcb4b947dc5e1b2e8f9c0
126 Risk Score

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 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/strik?utm_term=how+to+use+procreate+pocket+on+iphone PDF link annotation
    • http://jikusofare.mywebcommunity.org/vedenojuwig.pdfIn PDF document text
    • https://cdn.sqhk.co/maduzonuxoke/dgeTifW/xamusofojumabelisomedove.pdfIn PDF document text
    • http://hurleyshamburgers.com/visurogurug6g9w.pdfIn PDF document text
    • http://fasadi.site/lord_of_the_rings_castle_hillzca4y.pdfIn PDF document text
    • http://liko-sneakers.com/xereror4men.pdfIn PDF document text
    • http://bloomwithdeanna.com/78082014675av16v.pdfIn PDF document text
    • http://noksipals.online/xorodopusepodewefesaluddcyh.pdfIn PDF document text
    • https://cdn.sqhk.co/jogowijalaro/huMHgiC/83751157327.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gapuruxumeg/97843343151.pdfIn PDF document text
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_d0fa5c744e2041928728fed0619eee53.pdf?index=trueIn PDF document text
    • https://7abbf572-6989-4614-8246-9d5ba34cd238.filesusr.com/ugd/af841b_617826d0a2744a13ac61efb39cd9f796.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/86099376812.pdfIn PDF document text
    • https://a134ef9b-a212-4d8e-a35f-da3d896bbd40.filesusr.com/ugd/dadc92_f3290c1bf0804b028c71e83a9d067605.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/wemeguwava.pdfIn PDF document text
    • http://vexabimumemig.atwebpages.com/20186283577.pdfIn PDF document text
    • http://xovefopu.myartsonline.com/rodikibojobasuxusobiwavaf.pdfIn PDF document text
    • http://gavawekib.myartsonline.com/upsssc_vdo_syllabus_2020_sarkari_result.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/prayer_booklet_design.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/how_much_is_dunkin_donuts_box_of_joe_coffee.pdfIn PDF document text
    • https://f538c46d-6aff-4997-95da-320e40b30403.filesusr.com/ugd/262ba4_ee705f66c2854ac78b15a7d8bf6c8c18.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_off0000ea29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA29 5108 bytes
SHA-256: b0cd8715b624bdc3b7dc9f172b14ddd425c532207aa69cbb52658be6365652f3
font_01_sfnt_off0000fb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB95 11052 bytes
SHA-256: 40557a66c9249b45f9f69f3b84f172fc249743916e2a265c91c4f114fec0e4bf

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