Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e09afb6aeca8236…

MALICIOUS

PDF

92.0 KB Created: 2021-04-03 04:33:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 214b14cff471ce5f703364155eb83705 SHA-1: 3cd283fac640b87c980956c9777ce4a2de5e6537 SHA-256: 8e09afb6aeca82365fc4e30f8fcd58cce5deede3c8def14913715e92b17f60a6
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ClamAV detection and ML classifier also strongly suggest malicious intent. The primary purpose appears to be directing users to a network of websites, likely for SEO manipulation or to host malicious content, rather than delivering a direct exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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://golowaki.ru/award?keyword=canon+in+d+classical+guitar+sheet+music+pdf PDF link annotation
    • https://cdn.sqhk.co/solalokazili/gihe8jb/top_10_best_military_leaders_in_history.pdfIn PDF document text
    • https://rapexukiwivusa.weebly.com/uploads/1/3/4/8/134856806/tubaxedudetepixesose.pdfIn PDF document text
    • https://vigobekopu.weebly.com/uploads/1/3/2/3/132302998/bevikenivota.pdfIn PDF document text
    • https://dexuganepo.weebly.com/uploads/1/3/1/6/131608037/5ab56379cef9c.pdfIn PDF document text
    • https://mumilupoj.weebly.com/uploads/1/3/5/3/135351188/5751703.pdfIn PDF document text
    • https://cdn.sqhk.co/xukigipeduve/iigi7ih/68940148054.pdfIn PDF document text
    • http://fashion-deals.xyz/atlas_of_morphology_and_functional_anatomy_of_the_brainqgp10.pdfIn PDF document text
    • http://fenemixov.iblogger.org/resumen_del_libro_la_casa_de_bernarda_alba_rincon_del_vago_trabajos.pdfIn PDF document text
    • http://goodsun.space/2007_jeep_grand_cherokee_diesel_towing_capacityays14.pdfIn PDF document text
    • http://lamomusexosefe.66ghz.com/ontologia_filosofia.pdfIn PDF document text
    • https://jitotapo.weebly.com/uploads/1/3/5/3/135314003/f4d44fb31a6b38.pdfIn PDF document text
    • http://favowirikok.22web.org/8382035475.pdfIn PDF document text
    • http://pss77.ru/wavawih8k5v.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_f698e4aa7e9540ffbe0e60948ba2e570.pdf?index=trueIn PDF document text
    • https://03f57db0-fbcf-46ec-8713-21b5992b8512.filesusr.com/ugd/455f95_958919e4bf4c499c9a496e3faeeaa78c.pdf?index=trueIn PDF document text
    • https://69b3109a-7cce-4514-9193-d2106d9976ab.filesusr.com/ugd/3c2969_b3931dc09e8044989421662036136136.pdf?index=trueIn PDF document text
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_e563dc5709cb42158ec74f94f9bc40ef.pdf?index=trueIn PDF document text
    • http://pirefalanife.epizy.com/29453836852.pdfIn PDF document text
    • https://52aa71f3-9574-4e96-898b-bb16aa893b2c.filesusr.com/ugd/b13a71_ade70a75e04c4d10b478263de79939eb.pdf?index=trueIn PDF document text
    • http://befakugidutoj.rf.gd/19174183655.pdfIn PDF document text
    • http://vefelazubogimew.rf.gd/trust_deed_property_template.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11497 5476 bytes
SHA-256: 40a969cceea5c5d17eeae3398c66fb0753ae1b47a3b5ec2437f1a13744b845da
font_01_sfnt_off00012703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12703 11344 bytes
SHA-256: 7f3191a3ba72b2b9dd963dc08bcfb134b1f1dbde58f877336f37a702fba00b88
font_02_sfnt_off00014d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D27 16100 bytes
SHA-256: dbe3dd64dc066f428802739f18684eaf08c446fcda8cbe88d420f1ef9ee6b29b