Malicious PDF — malware analysis report

Static analysis result for SHA-256 8801b2750a86c313…

MALICIOUS

PDF

91.7 KB Created: 2021-04-07 08:40:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6b8fe5d76ff80c7b0dcbf96f6293aa3 SHA-1: 1f88e67b0e3b5033a016ab43fd7c709e39912626 SHA-256: 8801b2750a86c313edeaa6eb872280b44aa0a43e3982b8d20364ee74058116a0
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users. The primary URL, 'https://jumiwimov.ru/award?keyword=cancer+bacteriano+pdf', is suspicious and likely part of a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and numerous external links strongly indicate a malicious purpose, possibly involving the exploitation of PDF vulnerabilities or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/award?keyword=cancer+bacteriano+pdf
    • https://wilasumoleliwu.weebly.com/uploads/1/3/1/4/131414134/radebodevamuvi.pdf
    • http://pexawegowe.mywebcommunity.org/wonukenagabefexazezosep.pdf
    • https://cdn.sqhk.co/xaselavub/isS7jdu/melbourne_airport_control_tower_radio.pdf
    • https://tipuzinugex.weebly.com/uploads/1/3/2/6/132682040/692059.pdf
    • https://mikudope.weebly.com/uploads/1/3/5/3/135305195/temajabipixeguref.pdf
    • https://zajavaka.weebly.com/uploads/1/3/5/3/135322154/9365000.pdf
    • https://cdn.sqhk.co/zepipawetopi/eich3ib/90496032596.pdf
    • https://wakavofidokevi.weebly.com/uploads/1/3/2/6/132681750/newes.pdf
    • https://vuzavadakugodo.weebly.com/uploads/1/3/4/8/134857872/xinedopafo-jusuwin-dirusipad.pdf
    • https://tiwabegi.weebly.com/uploads/1/3/0/8/130874513/modixizu.pdf
    • https://bowalizixoled.weebly.com/uploads/1/3/1/8/131872289/rerumapob.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lakadutof/vefodikugowisopaxux.pdf
    • https://s3.amazonaws.com/pilazi/ultimate_ears_boom_3_portable_bluetooth_speaker_sale.pdf
    • https://s3.amazonaws.com/wexukufedepim/formal_email_writing_to_manager.pdf
    • https://s3.amazonaws.com/kovezodepugov/xinipurujudipibujovol.pdf
    • https://s3.amazonaws.com/dezajok/seven-_eleven_japan_co._ltd_annual_report.pdf
    • http://wewamamewiler.atwebpages.com/thyristor_working.pdf
    • https://s3.amazonaws.com/titugome/xenejawu.pdf
    • https://s3.amazonaws.com/jalasilunaz/87041141463.pdf
    • https://s3.amazonaws.com/gumegulaxi/state_court_of_fulton_county_docket_report.pdf
    • http://xekapakifujekem.onlinewebshop.net/swedish_language_textbook.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012668.bin
47195e971af1f8d69dd3e528a96c36b8ed408a1918ec3a46af1e166cdb31e0fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12668 4984 bytes
font_01_sfnt_off00013761.bin
d17e077c8c6e00552085ca8534b0bcfd570a2df17c56899a96012fd8f758bfa8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13761 12660 bytes

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