Malicious PDF — malware analysis report

Static analysis result for SHA-256 a531b67fea85c7a4…

MALICIOUS

PDF

67.3 KB Created: 2021-04-01 07:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: aea884cc1da29ba32aa571a67fa3e0db SHA-1: 99c5e6b1573fcab7e260bc4cbfb829a0ad2032ca SHA-256: a531b67fea85c7a4dc1af7ca080537864271e77df3554c213142974fcf379101
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, including ClamAV's Pdf.Phishing.Trojan detection. It functions as a link farm, containing numerous external links, with a primary malicious URL identified as `https://gimoguvi.ru/strik?utm_term=silent+hunter+3+download+completo+gratis`. The document's structure and the presence of many external links suggest an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/strik?utm_term=silent+hunter+3+download+completo+gratis PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4456116/normal_5ff8575d1f6f6.pdfIn PDF document text
    • http://kisewoweg.iblogger.org/89025492852.pdfIn PDF document text
    • http://confirmyourverifiedbadge.com/xeketiwavezavimularunulihb0md.pdfIn PDF document text
    • http://menbp.online/how_to_ask_someone_to_write_you_a_letter_of_recommendation_for_graduate_schoolx80x7.pdfIn PDF document text
    • http://ch-bewertung-2888.xyz/does_costco_have_kitchenaid_mixers5byh8.pdfIn PDF document text
    • http://jakebaxujimug.22web.org/vewixudodavodo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445731/normal_6023e5ffa03ca.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/a9270cae-1137-4bbd-b94a-60bcfbdc5a60/52910332564.pdfIn PDF document text
    • http://vutilunero.rf.gd/64049773786.pdfIn PDF document text
    • https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_33cbeedb07c94d73a5cdf495ce370997.pdf?index=trueIn PDF document text
    • https://52a72965-a6d2-471e-b66a-59a59a4d663b.filesusr.com/ugd/e643da_233ad5e142b6458db2c088ab848435db.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4597070-a772-4e0b-8421-db486a25d23c/sadlier_oxford_vocabulary_workshop_level_e_unit_6_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf75164b-bd95-48f8-9a8f-2e4b0d33d176/vurirofunudebafotoxe.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/wedazorarezivuveb.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/tupit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9852ced8-0ff9-4b94-bd1d-050c5c8e3966/19282639193.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a076fd97-1dd3-42ed-a116-0637637b69f2/92688412354.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_off0000c7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E3 5848 bytes
SHA-256: db973eaf363dc97022dbc92651060a8728fada831039a931a37bb0ef3e39d257
font_01_sfnt_off0000dbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAB 10044 bytes
SHA-256: 02d7d79bed35b02c204929d52975463f5335d8b6693528c64fcb74fd11ca0adb

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