Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ff95bc58f4cc01…

MALICIOUS

PDF

75.9 KB Created: 2021-03-15 06:33:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6e1f25077f84605bf689c7f415e39f74 SHA-1: 21ff1f65a03b688d92ff280a807eb027840d585a SHA-256: f8ff95bc58f4cc0188866ffaa0853cf4b1a8631136ef4fef1790095eef341720
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, indicating a phishing or trojan payload. It contains a large number of external links, many pointing to disposable hosting, suggesting it's part of a link farm designed to redirect users to potentially malicious sites. The primary malicious URL identified is https://dugedepap.ru/strik?utm_term=how+can+i+improve+my+drawing+skills.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dugedepap.ru/strik?utm_term=how+can+i+improve+my+drawing+skills PDF link annotation
    • https://cdn.sqhk.co/wajuletixex/gZhfnDg/tevogonedijinod.pdfIn PDF document text
    • https://cdn.sqhk.co/vixemujomu/vRifqEX/90276807435.pdfIn PDF document text
    • https://gexaxiwiwa.weebly.com/uploads/1/3/4/4/134480231/vapirudalarewig-fopadi-kelewerutiw.pdfIn PDF document text
    • https://cdn.sqhk.co/zavilisuga/zPIjc8d/final_fantasy_iii_snes_rom_hack.pdfIn PDF document text
    • https://bubebozozuj.weebly.com/uploads/1/3/1/8/131871643/c1c167c8e.pdfIn PDF document text
    • http://gepopusoka.mypressonline.com/cinderella_comic_book.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/ij1yOgd/grand_theft_auto_san_andreas_xbox_one_review.pdfIn PDF document text
    • https://fenipedixov.weebly.com/uploads/1/3/5/3/135385823/1720079.pdfIn PDF document text
    • https://tekemuwuva.weebly.com/uploads/1/3/0/7/130775778/7331977.pdfIn PDF document text
    • https://naweviwezufas.weebly.com/uploads/1/3/1/8/131856142/dixalizej.pdfIn PDF document text
    • http://vekisonoloze.sportsontheweb.net/jajokawu.pdfIn PDF document text
    • https://tifimiwarefimi.weebly.com/uploads/1/3/4/8/134895051/1d54b2a42688.pdfIn PDF document text
    • https://vulabomanuxuw.weebly.com/uploads/1/3/4/8/134857085/473bbc430ef.pdfIn PDF document text
    • https://cdn.sqhk.co/norekabalak/a6Qifm4/moduvubibukif.pdfIn PDF document text
    • https://lodikesilir.weebly.com/uploads/1/3/4/8/134868057/6554488.pdfIn PDF document text
    • https://kowokilu.weebly.com/uploads/1/3/0/7/130740572/0313126e0.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/1325f668-d0d2-417d-92f2-860a7a854372/sexusenutoxotulexan.pdfIn PDF document text
    • http://bowegasobufur.myartsonline.com/20136044398.pdfIn PDF document text
    • https://5a060084-92f5-4e09-b02e-bbac8bb45871.filesusr.com/ugd/05c943_f4c814b67e7d4f84a8cbb11d78b72b59.pdf?index=trueIn PDF document text
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_006aa1b7c6724e23b81fb5d142f0709f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7b0f8c1-f3fc-4a4e-925e-9dba369bfcf5/fabizopozikunenopuj.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_off0000e973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE973 5672 bytes
SHA-256: 922c8ce83746b8d78be0435c0a1b85606d611cc7064bf93644e9156d1fc5602c
font_01_sfnt_off0000fcca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCA 10504 bytes
SHA-256: c7c9eb120b82d163b63694eea5d6624e13c5b65261372511c812987d39b1b918