Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf2f15181002f48b…

MALICIOUS

PDF

78.0 KB Created: 2021-03-14 15:06:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: cb8db832f846bf6c0874a8b1c9add357 SHA-1: 9ddbf356c5a14c42b764ddc9a5ef35ece4a084b1 SHA-256: bf2f15181002f48b5f8763e3a4d1ea52fd2062ff3f7abaa7c6b4b90aa4880ef4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://xezojetit.ru/award?keyword=important+airlines+of+the+world+pdf PDF link annotation
    • https://cdn.sqhk.co/tatakakuwito/dvlLkFj/tumblr_app_play_store.pdfIn PDF document text
    • http://d-youtube.com/kadanulefepobalelogfl8ff.pdfIn PDF document text
    • http://spainsale.pro/baylor_academic_integrity_quiz_answersujf8r.pdfIn PDF document text
    • https://cdn.sqhk.co/pimabosi/hd2xqxd/water_slide_repair_games_unblocked.pdfIn PDF document text
    • http://fb-pageunderreview.com/71248422955wpp1d.pdfIn PDF document text
    • https://cdn.sqhk.co/jivazufevi/ciiijjW/marvel_hero_tales_spider_man_value.pdfIn PDF document text
    • http://artrosil.xyz/11561761086ecucx.pdfIn PDF document text
    • http://pe50off.pro/jusuxofudeynv4a.pdfIn PDF document text
    • http://prizinsta.site/atkins_molecules2j138.pdfIn PDF document text
    • https://cdn.sqhk.co/giruzegovu/NvkhaJ9/5709356202.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/28915379-f025-4cf6-a849-c0438c158953/rafasuvazewobubibeziso.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/balancing_redox_reactions_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/xibazizufaretafegoxew.pdfIn PDF document text
    • https://e22e8d81-f41f-4d51-abb1-39b19d2d32bb.filesusr.com/ugd/96bf9d_f30d6e068dc64ba4b831f06990de1c0e.pdf?index=trueIn PDF document text
    • https://24451074-f53b-4065-993c-779ba3957988.filesusr.com/ugd/0ae25f_47c304ecd3d7499696aff641816efa7e.pdf?index=trueIn PDF document text
    • https://c2bc7a71-cb21-434c-84f6-8d2fc09ed56d.filesusr.com/ugd/03ae60_ecbca82597e64e659370f4f24440c695.pdf?index=trueIn PDF document text
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_6e91767e792b4ea5977d728105724e4d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2e3742b-bd91-480d-9574-842ba558117e/71020254650.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/236b84e9-ce88-4f2c-9c64-5610d8c6f808/chronological_bible_app_esv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3f18759-efc8-41be-a9af-ad6bb0e5fc39/xetatafagalemewesow.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_off0000f63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63F 5312 bytes
SHA-256: c1201046152b4b6ff9af6b363b81e6a210c89b49875258641d12214056d60deb
font_01_sfnt_off00010831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10831 10212 bytes
SHA-256: 8a7982eb8ebb9cf11789fd3ce0a5365c1b1e12ea4f90171c61e28dec8c426f55

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