Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b8301ced3e27394…

MALICIOUS

PDF

74.0 KB Created: 2021-05-08 08:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1824f88d9c3ea77c861d87fcf4c05144 SHA-1: 8be384a0ec00c0ad0f2a81de6bd70c03b1342727 SHA-256: 1b8301ced3e273946044d822be2685f7e59f2f7789388e312f63f5ce6238d3fd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by heuristics as a link farm on disposable hosting. ClamAV and ML classifiers also flagged the PDF as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains references to 'Acer screen no signal' and 'wkhtmltopdf', suggesting a lure related to technical issues.

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://gimoguvi.ru/strik?utm_term=acer+screen+no+signal PDF link annotation
    • https://cdn.sqhk.co/ledodatefu/TiceIhh/tulus.pdfIn PDF document text
    • https://cdn.sqhk.co/xojelumegasi/jdCjbfs/borubanerasid.pdfIn PDF document text
    • https://cdn.sqhk.co/rumoligodo/8enukhe/100_greatest_rock_hits_cd.pdfIn PDF document text
    • https://cdn.sqhk.co/povewepalu/qgjFejh/6907231367.pdfIn PDF document text
    • http://bodegumuxizobi.22web.org/permitted_development_guidelines_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/tugirujozi/iffjhij/shooter_movie_live_streaming.pdfIn PDF document text
    • https://cdn.sqhk.co/vapiwibisa/4heYh0r/zogobuzavisujogikitusozex.pdfIn PDF document text
    • http://joxinajezaxufas.22web.org/2013_yfz_450_review.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzozuni/fhrUajd/cute_hairstyles_for_short_hair_baddie.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/32ac6f91-476d-4998-abae-0e1597621113/which_yoga_is_best_for_gastric_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93ed64aa-4975-4359-a74d-8eaecd40e799/dezagonevoxemub.pdfIn PDF document text
    • http://papitanado.rf.gd/muzufovanagorozodulumof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f86f7009-8ab4-477d-8346-ef78a0294639/mapozu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b43a2fef-4635-4012-94cf-a9aeb50b2a04/where_can_i_take_the_minnesota_multiphasic_personality_inventory.pdfIn PDF document text
    • http://zatupux.rf.gd/change_blade_on_craftsman_miter_saw_with_laser.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf793129-2704-497a-af32-2d50ec291fdf/biddeford_heated_blanket_flashing_light.pdfIn PDF document text
    • http://favuzokusom.rf.gd/olanda_alkmaar_mercato_del_formaggio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a51ae03e-6c18-45eb-bf90-a4fc7a75b79c/fisher_price_swing_rainforest_manual.pdfIn PDF document text
    • http://gudukamu.rf.gd/60657313830.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_off0000e566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE566 4956 bytes
SHA-256: 3b1bb8819eedaa2e15b5fe9cb5317dbb3f6ad937a56d9734398bbc939448feae
font_01_sfnt_off0000f655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF655 10756 bytes
SHA-256: be5a647c3db6e6a30a85ce250c65e62b494b96200f7c8db3ded4f93aacf125ab

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