Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3ac04ae90df1e1f…

MALICIOUS

PDF

78.7 KB Created: 2021-03-24 04:04:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 404449084895a55a8671dba0d7b754c2 SHA-1: cfdce9584091f7b040d3ba1def561bfdc16f02ac SHA-256: f3ac04ae90df1e1faa6dde847094c6f3e45dd0bbcdee1966b569fc542c9e3eef
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing or a trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity designed to redirect users to potentially harmful sites.

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://nipisod.ru/award?keyword=how+to+write+adjustment+letter+pdf PDF link annotation
    • https://xorizelipuv.weebly.com/uploads/1/3/1/6/131637744/papojasareta_xisigazasopu_pexixuponipu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460060/normal_5ff1417c1921b.pdfIn PDF document text
    • http://gagitevanonuti.mywebcommunity.org/neologismo_definicion.pdfIn PDF document text
    • https://nefupoxuwuridek.weebly.com/uploads/1/3/4/7/134747690/kulonamifetiziz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485318/normal_5ff14d2137ee2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365582/normal_5ffef11e5e7ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368500/normal_5ff1e45223e72.pdfIn PDF document text
    • https://pugoxadegile.weebly.com/uploads/1/3/1/3/131379866/tobabezagewitofa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425919/normal_6030a6055350f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387701/normal_5fcfe647862e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459027/normal_6007bbf4f2db6.pdfIn PDF document text
    • http://fb-ig-violation.com/xegomar0ibk.pdfIn PDF document text
    • http://itawomen.fun/forest_rescue_2_game_downloadqgoym.pdfIn PDF document text
    • https://gomabimasukefop.weebly.com/uploads/1/3/4/4/134491899/fexatotowezogivamu.pdfIn PDF document text
    • http://blacklaser.ru/8806532107705icn.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/lolaritemukole/picture_animation_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/memoxaganugakawikifetote.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/arroceria_formentera_madrid.pdfIn PDF document text
    • http://fojakosi.atwebpages.com/tawetorukokaluliv.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/dungeon_leveling_guide_wow_classic.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_off0000f4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D6 5316 bytes
SHA-256: 762d58228544fee4dfc5c5ae56fb4a87a974376d8d745913db0eadfaae272a90
font_01_sfnt_off000106e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E9 10948 bytes
SHA-256: 5e6fb009123c5f6ee4129565c1bff981163fe084316da7f82de7617ab891bc2f

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