Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffdf4a1fbb5a7b0a…

MALICIOUS

PDF

122.3 KB Created: 2021-05-26 07:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: befaa464709d88fefbd9aae47558004e SHA-1: 7aafdcc2f1c2962086237137d08dc5641d737ca6 SHA-256: ffdf4a1fbb5a7b0acfb5d4c9223c1a22133a5fdc8fd7f851bf27560b480df275
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms or phishing sites, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing. While no scripts were directly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://zajinet.ru/strik?utm_term=braveheart+and+titanic+piano+sheet+pdf PDF link annotation
    • https://tekoboxini.weebly.com/uploads/1/3/0/8/130814877/genokasabolume.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377109/normal_600d1f173c5cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426687/normal_60668bc6706e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385648/normal_601ce19f3b01d.pdfIn PDF document text
    • https://mojipolizu.weebly.com/uploads/1/3/4/3/134318612/zovigaz-zonelo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459029/normal_603a1dd6a406e.pdfIn PDF document text
    • https://bugituwixumanuz.weebly.com/uploads/1/3/4/7/134722584/7bd93f23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417827/normal_603317d79fc0d.pdfIn PDF document text
    • https://gusobukenifoku.weebly.com/uploads/1/3/4/5/134525986/simoxakexeze.pdfIn PDF document text
    • https://tonukujile.weebly.com/uploads/1/3/1/8/131857071/lerajabeveninok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/99819955872.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/english_book_grade_10_download.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/bovemab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5f0d8bf-80b4-4ca2-ab8d-21bfa0970d63/ruxeba.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/58721186000.pdfIn PDF document text
    • https://s3.amazonaws.com/pasutiz/70602770882.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/fox_tv_guide_tampa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2d9944e-43b6-47aa-8d79-020951cce1cf/kusopezufa.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/activesheet._protect_vba_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abcccce1-b5f5-4cdd-9807-53cf5b8722c6/schumacher_battery_charger_se_5212a_schematic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/095b3ec3-b568-4f3d-a760-c347fa756358/ransome_bobcat_mower_dealers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac3ef178-7fbe-471a-ae97-970a443062de/ministers_cat_scrooge.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_off0001a022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A022 5320 bytes
SHA-256: e0d4dcd1bfa91cab49b0e52975474ee3a8b8f3477943ef0afeeca195f6f73b21
font_01_sfnt_off0001b23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B23E 12456 bytes
SHA-256: 8a4a1571d100adbecb379bd2fe88242f1a0b1accc6f173f65c68e6e5d55911d4

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