Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f7e093c1dd2ca5b…

MALICIOUS

PDF

76.5 KB Created: 2021-04-05 14:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6e6b58a179d128911e9bc3255baeb466 SHA-1: f1ba665da486d0e89aab22c79d233df2fc28cdc2 SHA-256: 2f7e093c1dd2ca5be8d60a2c70a43a6c96d83ce14a8b2f360cec1da1d8c428c8
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It functions as a link farm, containing numerous external URLs, one of which is `https://golowaki.ru/123?utm_term=sopcast+android+tv+romania`. The document body contains garbled text and metadata related to its creation by wkhtmltopdf, suggesting it was programmatically generated to host these links. The presence of many external links indicates an attempt to redirect users to potentially malicious sites.

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://golowaki.ru/123?utm_term=sopcast+android+tv+romania PDF link annotation
    • https://cdn.sqhk.co/lawipavoso/ajeideB/ligaputibajogazarile.pdfIn PDF document text
    • https://cdn.sqhk.co/pojukitogex/jiwE8FM/vasofogovo.pdfIn PDF document text
    • https://cdn.sqhk.co/pefevepufi/ghcigSG/followers_tracker_for_instagram_online.pdfIn PDF document text
    • https://jokuduzasaru.weebly.com/uploads/1/3/1/3/131381103/zesoges-fewijebekude.pdfIn PDF document text
    • https://cdn.sqhk.co/jinuzekovodi/gcez0ge/20785977784.pdfIn PDF document text
    • https://minaraxu.weebly.com/uploads/1/3/4/7/134765114/5958534.pdfIn PDF document text
    • https://dofufegudi.weebly.com/uploads/1/3/1/3/131381881/4277786.pdfIn PDF document text
    • https://cdn.sqhk.co/nexetifosam/Lhihbje/dual_desk_home_office_furniture.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_7055444f097147888355af1e9e87f9e5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/67408487126.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/98502176252.pdfIn PDF document text
    • https://000bb656-a8cb-4e8b-9327-0b0ec99f56fe.filesusr.com/ugd/3f812e_056f053c35044e5bb1b5949cdcc3eddb.pdf?index=trueIn PDF document text
    • https://033f1a72-e514-447f-b44b-9d234b37386c.filesusr.com/ugd/f05202_c5039fd7e9ca45108a65e077019dee08.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6af40dde-684d-4ddc-9ed3-6f66e806195d/lawakapegavi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5043cb0-7890-4d84-a2fb-8c3951e18c9d/what_is_another_word_for_sequential.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3eded59-601d-41d8-9146-74dfa4b98b66/7156176533.pdfIn PDF document text
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_36dfa477accd4e27b003ee9818e88bc1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/polexebuj/23507633915.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa363403-2efa-43da-ad5e-4d042a4c77fd/dujelijakaxozadi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7F 5020 bytes
SHA-256: c87a1cc8977763cd567279e8eb9ea85c12a42ff7609e8832aeea7807d306f3db
font_01_sfnt_off0000ef5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5F 11752 bytes
SHA-256: 2d4fd15ba671468e6f55f991aadd0c8c106cf5bea08c8bc2574b0b9d50e19b2d
font_02_sfnt_off000114f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F6 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361