Malicious PDF — malware analysis report

Static analysis result for SHA-256 675fe66e94ec3e44…

MALICIOUS

PDF

81.9 KB Created: 2021-06-11 06:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: ba404d362b220f521291d0382e101c0a SHA-1: 511fab030d500ca2a6725ab5ee63b1840ac0f3e4 SHA-256: 675fe66e94ec3e44acf0d49cac15f697e269f85245a2a3856721e753fc2abe74
134 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or scam attempt. The primary external URI, 'https://pistant.ru/pbw?utm_term=free+fire+advanced+server+link+download', is presented as a download for a game, likely a lure. ClamAV detection and ML classification strongly indicate malicious intent, specifically a phishing trojan.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/pbw?utm_term=free+fire+advanced+server+link+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495055/normal_601ef1197f1aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450336/normal_6007503bdf2f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464327/normal_5fd3dad54b608.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370285/normal_60c291aa58a5b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fokopaviwu.pbworks.com/w/file/fetch/144568053/13684420458.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d8a09c6-f41c-45a9-8864-6ad6e02f676b/1_metro_cbico_equivale_a_quantos_metros_quadrados.pdfIn PDF document text
    • http://wuranosa.pbworks.com/w/file/fetch/145015272/74573140439.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02ee34ae-9730-4744-9752-bc769cde8657/living_on_one_dollar_a_day_worksheet_answer_key.pdfIn PDF document text
    • http://damopijos.pbworks.com/w/file/fetch/144611574/44190308247.pdfIn PDF document text
    • http://rozeluf.pbworks.com/f/english_vocabulary_with_pictures_free_download.pdfIn PDF document text
    • http://lorugaz.pbworks.com/w/file/fetch/144655686/57348938164.pdfIn PDF document text
    • http://gopamux.pbworks.com/f/miwodixegirori.pdfIn PDF document text
    • http://kibumezi.pbworks.com/w/file/fetch/144460335/roblox_apk_mod_unlimited_robux_2020.pdfIn PDF document text
    • http://lezakoliz.pbworks.com/f/lupemodubozogofopaxal.pdfIn PDF document text
    • http://sakulibur.pbworks.com/w/file/fetch/144628746/sawewasimira.pdfIn PDF document text
    • http://vafakana.pbworks.com/f/lekenivevozowafu.pdfIn PDF document text
    • http://pikalunik.pbworks.com/w/file/fetch/144707787/summarize_the_first_paragraph_of_the_declaration_of_independence.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c3f9383-2eaa-47e8-8eeb-77d293d32d95/ditekipijeliva.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ead0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD0 5188 bytes
SHA-256: 9912fff81d93d4db478025066ffee3e570106b71eebb6382f7e877fd55e7a8a7
font_01_sfnt_off0000fca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA0 11612 bytes
SHA-256: 9afb61265da51a5d9c474089f0c015fdcbfa86a9be9e8625b859a62919dda69a
font_02_sfnt_off000122df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DF 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd