Malicious PDF — malware analysis report

Static analysis result for SHA-256 900292c3c664e709…

MALICIOUS

PDF

92.4 KB Created: 2021-06-04 22:38:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: c6f7a1936ebb890c0ba99cfd9e3f3603 SHA-1: 9b3f42868f37b55f3a26923f31dd1a1c1f39c9ad SHA-256: 900292c3c664e70998cc5f6b61c07c1b7646b4cc79247bb0f559e1915d93cefc
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://philabc.ru/pbw?utm_term=example+of+business+plan+coffee+shop PDF link annotation
    • https://gimelukisisira.weebly.com/uploads/1/3/4/0/134040832/389731.pdfIn PDF document text
    • https://moginirem.weebly.com/uploads/1/3/4/7/134769545/1043713.pdfIn PDF document text
    • https://tifevijokob.weebly.com/uploads/1/3/5/3/135351552/vatovawosowolagaget.pdfIn PDF document text
    • https://zewazinox.weebly.com/uploads/1/3/4/2/134235380/vajozemirisimufat.pdfIn PDF document text
    • https://pijaremurepapo.weebly.com/uploads/1/3/1/4/131406688/7800304.pdfIn PDF document text
    • https://povutepumik.weebly.com/uploads/1/3/2/7/132741486/2559501.pdfIn PDF document text
    • https://sogekapi.weebly.com/uploads/1/3/4/8/134891770/wewesubejifodibukipo.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
    • http://zepadatoju.pbworks.com/f/who_won_mega_cash_days_2020_spoilers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9af16b43-8345-4d8c-b28e-45e664d6b36d/free_printable_reading_worksheets_for_1st_and_2nd_grade.pdfIn PDF document text
    • http://funesut.pbworks.com/f/zamipuzakutafosiliridu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fa2b735-fafd-48b6-bba0-2149d0391fd0/50739109311.pdfIn PDF document text
    • http://supatibu.pbworks.com/f/60512437949.pdfIn PDF document text
    • http://tujedet.pbworks.com/f/776218681.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3efed351-050c-447f-a03e-d6583140a7aa/pilisotitotar.pdfIn PDF document text
    • http://werinenimuta.pbworks.com/f/gejijasetategarituno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77c5db4b-ec50-4ee0-999c-cfd3a8750c64/free_online_crossword_puzzles_la_times_penny_dell.pdfIn PDF document text
    • http://xosufixemuf.pbworks.com/f/21167681426.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f27be886-d55c-426c-9030-2c3cb127f25b/12248098319.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_off00011f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F74 5128 bytes
SHA-256: d42bfe11bb22e58f07e86f31cdefbbbd557a34e39b400822414f45194e075d1d
font_01_sfnt_off000130c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C0 11112 bytes
SHA-256: 7ad9fe17323817b390ec10de9f8dbf1b5a776d35604051cdb0160c727fa717ba
font_02_sfnt_off00015688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15688 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f