Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a7a30fa8e232216…

MALICIOUS

PDF

84.7 KB Created: 2021-03-23 23:53:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1b9a6a76d6ba170a987b8f79ae61dd10 SHA-1: 1e83d3e1e72fbcb73057dadd5262650ad8b47906 SHA-256: 4a7a30fa8e232216c392f83736f944f1b3c780b89a5c7ca704b6e1074c8c21de
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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.
  • 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://maypoin.ru/strik?utm_term=problemas+sociales+en+mexico+actualmente PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4491433/normal_6035734519419.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487187/normal_600fab944086d.pdfIn PDF document text
    • https://favonewe.weebly.com/uploads/1/3/2/6/132695639/74087.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387419/normal_6054161b6f800.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473902/normal_6051dc8c74155.pdfIn PDF document text
    • https://levarimabogi.weebly.com/uploads/1/3/5/3/135328943/dbd2ac5.pdfIn PDF document text
    • https://vinazawodix.weebly.com/uploads/1/3/4/3/134352366/gisepuzo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379043/normal_6043566548bd0.pdfIn PDF document text
    • https://wutupebepa.weebly.com/uploads/1/3/3/9/133997315/fd62ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393772/normal_6022ceac26359.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381108/normal_5fed634e7f301.pdfIn PDF document text
    • https://juwudusufutibor.weebly.com/uploads/1/3/0/8/130873872/46e8d8396ac90.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/vifusupegiza/73812035807.pdfIn PDF document text
    • https://e714dd98-3e42-4604-aba1-6d4b2506b1a8.filesusr.com/ugd/742965_132932ce25c341c5875eebc31746c534.pdf?index=trueIn PDF document text
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_2eed32ca56cb41a1818c68376102afa9.pdf?index=trueIn PDF document text
    • https://d6d3a1c5-32ce-46e9-ae92-c5b8d84d65d9.filesusr.com/ugd/a3b54b_5539820328ab491aa796af8e43bf9d10.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tafogusegabomu/super_bomberman_games.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2c93d0c-267d-4a86-ac88-9281a0b2957b/wulewenapux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e591dd5-d050-4173-8eb4-c651aca07a2c/81763794401.pdfIn PDF document text
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_d6d04d967d3a44098a04361e14d17df3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5c65008-45fa-443a-854c-7babce400a31/how_do_i_turn_on_my_rain_bird_sprinkler_system_after_winter.pdfIn PDF document text
    • https://7b4e975e-109f-4397-a679-93e438ff1453.filesusr.com/ugd/c33f71_6448aa58f0e04dbebb926659b32f5211.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/movavi_video_converter_free_trial.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_off000108ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AB 5156 bytes
SHA-256: 8979f43f8a77ce305952f9b2aaaa4bc0838d7f5e57c41a7adf5ca271c75c8bcf
font_01_sfnt_off00011a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1C 12600 bytes
SHA-256: a3b7461c08ac456dd239e9400addf7b1e1d8bab3a97acb14f4a3bfd67c28b775