Malicious PDF — malware analysis report

Static analysis result for SHA-256 00514dcca1d7d8bb…

MALICIOUS

PDF

81.2 KB Created: 2020-11-24 18:12:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 1887e4726251d4e0880e4b2e8b70274b SHA-1: bc929646b493d404d116dd26375047567dc20125 SHA-256: 00514dcca1d7d8bbbdfbb65b3ac64cbdbeff0e4de548db6c474876f67a2639ab
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services and domains with unknown reputations, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The primary URL, 'https://trafffi.ru/strik?utm_term=treasure+island+book+pdf+free+download', suggests a lure related to downloading a book, which is a common phishing tactic.

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://trafffi.ru/strik?utm_term=treasure+island+book+pdf+free+download PDF link annotation
    • https://xoropugu.weebly.com/uploads/1/3/4/7/134707238/5742362.pdfIn PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/a3d7e1ca7523529.pdfIn PDF document text
    • https://wovuxekas.weebly.com/uploads/1/3/4/3/134379471/ginaguterodemu-kujuzojigas-najetuzojoti.pdfIn PDF document text
    • https://pavowojavujide.weebly.com/uploads/1/3/1/3/131398322/cc5db455b7.pdfIn PDF document text
    • https://runebipunozup.weebly.com/uploads/1/3/1/4/131406604/c048541.pdfIn PDF document text
    • https://nikibowo.weebly.com/uploads/1/3/4/3/134354591/jadamig.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/5f0169ea-45fd-4b90-8923-aca3790b397e/kibofururufanis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc74f12b-c82a-48c7-9601-538b69fc385e/xaparedu.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/geektyper_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d539332-af3b-4380-92c2-e8b034f3eea6/stardew_valley_bean_hotpot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1dd3c77-cbac-47d1-b222-42036416f40b/pokupixolakejevoza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2d288a2-89cb-405f-981d-b6d13980e47d/yahoo_mail_login_att.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/82749996413.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad0dbe33-f8b6-4a20-a258-478cb520e865/dispara_yo_ya_estoy_muerto_personajes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ac78e97-b1ff-4b85-a452-d3f7e964bfad/67418186258.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db8d3087-1a98-42c9-ab59-5c738b720cb4/delaware_wrestling_state_champions.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_off00010174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10174 5280 bytes
SHA-256: f2267dbd32f79a31a335e4e4956e9b966452335714748cc60cae3d383408c00d
font_01_sfnt_off0001137e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137E 10452 bytes
SHA-256: 94350c5fc170f8edb20bfbfe5a301454590010fe1a8e12a58ba63d8da6bb181d

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