Malicious PDF — malware analysis report

Static analysis result for SHA-256 7502bf9a79ff48ef…

MALICIOUS

PDF

76.9 KB Created: 2021-04-05 23:34:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 370647ac780a84877aaab1ff299c98e8 SHA-1: ca74338bd6f9d6fa5b58d214c69dd4668f4e3268 SHA-256: 7502bf9a79ff48ef9ca2a24d0c459525546eec6da86d57cd2948097eaa3058f3
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm containing numerous external links to other PDFs, many hosted on disposable domains. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The primary malicious activity observed is the distribution of a large number of links, likely intended to direct users to malicious sites or to manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://midufefew.ru/strik?utm_term=what+is+a+meeting+called+after+an+event PDF link annotation
    • https://kajubuti.weebly.com/uploads/1/3/2/6/132680994/d4366acf.pdfIn PDF document text
    • https://didizotaxudip.weebly.com/uploads/1/3/4/6/134619455/8e9101.pdfIn PDF document text
    • https://lalusilimedam.weebly.com/uploads/1/3/0/9/130969483/702241.pdfIn PDF document text
    • https://dajikapepexav.weebly.com/uploads/1/3/4/5/134597014/jusagigowavut.pdfIn PDF document text
    • https://gokejaxax.weebly.com/uploads/1/3/6/0/136056436/raziduwopuzotamin.pdfIn PDF document text
    • https://vexibalob.weebly.com/uploads/1/3/4/8/134896466/maburapodixafenez.pdfIn PDF document text
    • https://jixatazibasuv.weebly.com/uploads/1/3/4/4/134402985/fazelodakifiwivan.pdfIn PDF document text
    • https://xifekuvazunavel.weebly.com/uploads/1/3/4/7/134748582/385bcd82ba60d.pdfIn PDF document text
    • http://jigiwikab.22web.org/joindre_dans_word.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/a0eebddd-4624-463f-b77c-e5f0ef2f5034/3935184123.pdfIn PDF document text
    • http://vunodakurawofo.rf.gd/30403740607.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b6e7bb3-ac28-4a79-b4cf-91b8bcb285ae/social_learning_theory_of_bandura_ppt.pdfIn PDF document text
    • https://ce099f17-eb12-430b-a452-8d789b3ee5a8.filesusr.com/ugd/aef5b7_c084e8b2c2b14c10a6452d40dcd06489.pdf?index=trueIn PDF document text
    • http://mafofeguf.epizy.com/sajubaletanutafulofowatu.pdfIn PDF document text
    • http://ralakevitodabaj.epizy.com/regular_verb_list_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bc500df-1e4c-4056-8352-ff5baf6a751f/silabilowofuvon.pdfIn PDF document text
    • http://gixopefujunop.rf.gd/37095145837.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf781d72-3ea5-4738-a27c-6bdaa5bcfb05/the_big_game_book_summary.pdfIn PDF document text
    • https://f8206d31-21c4-4aef-9da9-e4259ded718a.filesusr.com/ugd/c2bdac_a2dbb67d224a42c898b2ff3e9cf2370d.pdf?index=trueIn PDF document text
    • http://zinuruxe.epizy.com/padasebired.pdfIn PDF document text
    • https://359ea524-acbf-40a7-8d58-ee96a8f10bc8.filesusr.com/ugd/ca2e76_813dd9190ff1482ab934ba9a6ab3f9fc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d4dea33-819b-49dc-92aa-481cbca58a6e/carry_on_luggage_sale.pdfIn PDF document text
    • http://mewarur.rf.gd/75325873794.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_off0000ee4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4E 5508 bytes
SHA-256: 4c13980459734e99ce6c49e985af10bd7e1b0d6a66c962e39b5ebe12373fdad8
font_01_sfnt_off000100ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100ED 10880 bytes
SHA-256: e89b331a79b616c662ef66a785a35433adc301e1939bb93536e9cc3b0cfa88ca