Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2fba22e558b087f…

MALICIOUS

PDF

83.3 KB Created: 2021-03-14 10:42:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 512908bba0991c161dc4b3702e946cc4 SHA-1: d74d7f65750cacf72fd488f12738dc374194d789 SHA-256: b2fba22e558b087fce834b12c762909cd2bb72e73bc5e371d7dd65fa60d97cf1
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with one prominent URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://vilenefex.ru/strik?utm_term=how+to+use+a+ti+baii+plus+calculator
    • https://kesozelakix.weebly.com/uploads/1/3/5/3/135300748/cdefd.pdf
    • http://kokulet.22web.org/powermore_208cc_engine.pdf
    • https://luludosob.weebly.com/uploads/1/3/4/7/134703274/vofuwap.pdf
    • https://niwanuve.weebly.com/uploads/1/3/1/4/131406473/rudokuvusapi_danereku_sudomiwabat_lujomedijunere.pdf
    • http://sarawavenudiwap.mygamesonline.org/97427619487.pdf
    • http://fafijitesulexiz.mygamesonline.org/59278721845.pdf
    • https://fejejupusojovif.weebly.com/uploads/1/3/1/4/131483068/sofajobi.pdf
    • http://medolufinumul.sportsontheweb.net/94789402360.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gafigozigu.epizy.com/new_christian_worship_songs_lyrics_2019_playlist_-_best_praise_and_worship_songs_2019_with_lyrics.pdf
    • https://f4ef19d8-372f-49db-bbb6-0f5e16bfa625.filesusr.com/ugd/070799_ef97ec1cd18148d6aec197dc731669d9.pdf?index=true
    • https://d33b8dfc-9792-4d26-9d81-613d0bd32a71.filesusr.com/ugd/d34367_421050d3f0c941f3bf3c3e62a59aa627.pdf?index=true
    • https://s3.amazonaws.com/gumagabu/54179704992.pdf
    • https://0c2a99dd-71fd-4a0d-b96f-672cfa785c21.filesusr.com/ugd/515c54_961e7a460bb748609e1d9e1481210110.pdf?index=true
    • https://2aa89031-56ac-4de1-b828-aabe99840ec8.filesusr.com/ugd/cf14a4_b098ec6aa5aa4fca8b1c79ef42d4bf25.pdf?index=true
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_415320a26c1041838eba23961ad0f8ff.pdf?index=true
    • https://s3.amazonaws.com/resisuna/gds_pay_commission_report_latest.pdf
    • https://0c7b1e5d-10e9-4c66-9a64-57e6babc74f3.filesusr.com/ugd/6b59ba_a68d309a71cf43d48036c966c5afd173.pdf?index=true
    • https://s3.amazonaws.com/zewimu/kafaxubefuwulut.pdf
    • http://seriwod.epizy.com/rulowotatokexapipul.pdf
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_7edc9d0b94494e0aa02d6cd85d4b83c2.pdf?index=true
    • https://18b09f4e-de4d-4c1b-9fe6-be55c63b1c00.filesusr.com/ugd/cd81e9_376cf9f553ad4f4c9a78d63f0f79b6d4.pdf?index=true
    • https://s3.amazonaws.com/welanisowari/vs_code_format_json_file.pdf
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_b013740836b943d59f772b20bb2736ff.pdf?index=true
    • 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_off00010359.bin
26ea2793c5834b8f0db08d84881185c699802631bb54c5ac21de1147ba68ab1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10359 5120 bytes
font_01_sfnt_off000114dd.bin
257e9f1feb5978e8d073ce116d6b7e72c484873695a9e8e84f1bae961ed58ed5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114DD 12300 bytes

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