Malicious PDF — malware analysis report

Static analysis result for SHA-256 f87023d4c25e86f3…

MALICIOUS

PDF

73.5 KB Created: 2021-03-22 18:52:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 0d2d68b931cfb94cd887c7b1bac9024b SHA-1: 5083cc70d7bab16934c4755a84617f15db52e09e SHA-256: f87023d4c25e86f3d30bc0034c902d3f271613becd69faec9400e6475da67816
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF that contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The primary URL, jumiwimov.ru, appears to be part of a link farm designed to manipulate search engine results or direct users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://jumiwimov.ru/strik?utm_term=cask+of+amontillado+questions PDF link annotation
    • https://mutuwafidiz.weebly.com/uploads/1/3/6/0/136095616/fetagal_filefurajup_wuwezunok.pdfIn PDF document text
    • http://kimokabif.medianewsonline.com/66956029143.pdfIn PDF document text
    • http://prodit.space/at_t_mobile_security_call_protect_plus_reviewrvaoh.pdfIn PDF document text
    • http://indital.space/how_to_put_rainforest_jumperoo_down0v13y.pdfIn PDF document text
    • https://mujebaroso.weebly.com/uploads/1/3/4/1/134131407/752712.pdfIn PDF document text
    • https://wubawujol.weebly.com/uploads/1/3/4/2/134266052/2556cdb170e.pdfIn PDF document text
    • https://cdn.sqhk.co/pajijolabalu/XihhdA3/nemapogup.pdfIn PDF document text
    • https://lokudepapina.weebly.com/uploads/1/3/5/3/135325929/mipinuda.pdfIn PDF document text
    • http://kevifiregerufug.scienceontheweb.net/72663530305.pdfIn PDF document text
    • https://cdn.sqhk.co/xoguvamev/VjfXhhG/77636686698.pdfIn PDF document text
    • https://cdn.sqhk.co/zokoxirinuz/gghcgdj/chargepoint_stock_price_today.pdfIn PDF document text
    • https://puxibaso.weebly.com/uploads/1/3/0/9/130968956/latewizu.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/dikomavomem/34240592837.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/zekuwuf.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/aarya_movie_song_malayalam.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/bujefi.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_off0000c7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EB 5052 bytes
SHA-256: 9236f64edbaaa33bc8da8ebb41d222074ffcbd664c53b1dfbfb1a2a9cbf4e8aa
font_01_sfnt_off0000d90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90A 13476 bytes
SHA-256: 4ea3195c52e3c49affa5a1128af8b3061d0748ac5e1b7aa6e832bdad0c3057f6
font_02_sfnt_off00010464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10464 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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