Malicious PDF — malware analysis report

Static analysis result for SHA-256 29435f9c46804075…

MALICIOUS

PDF

75.2 KB Created: 2021-02-27 10:50:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03df1fec7bebc52f629519f6d530d3be SHA-1: ab7e51c3517b88313596100b97353c73c4dd8e24 SHA-256: 29435f9c468040752109b55587653ddbcbed2175dd8e9b585d489ecb361408b1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, which is a common technique for SEO manipulation or directing users to malicious sites. ClamAV detected this file as a phishing trojan, and ML classification strongly supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/wix?keyword=toledo+ohio+wind+directions
    • https://cdn.sqhk.co/budajawisore/icCmggX/niganuxujonivogal.pdf
    • https://cdn.sqhk.co/pumibavi/OdXjsii/download_ninja_blade_pc_highly_compressed.pdf
    • https://cdn.sqhk.co/zubavagi/jeZkTix/horror_escapes_la_groupon.pdf
    • https://cdn.sqhk.co/puxolika/fm6hdrK/photo_collage_apple_app.pdf
    • https://dusitibepilezu.weebly.com/uploads/1/3/1/4/131437978/b1c61068e47.pdf
    • https://modagifamu.weebly.com/uploads/1/3/5/3/135341464/jubutilufise.pdf
    • https://cdn.sqhk.co/wavefekus/fHRJyjb/okay_madam_movie_cast.pdf
    • https://cdn.sqhk.co/xuwadezab/LmhojbT/war_and_order_castle_requirements.pdf
    • https://cdn.sqhk.co/lasanamemego/BhaMiaY/megabamixunaluzor.pdf
    • https://cdn.sqhk.co/sesizame/ijjiiih/cruise_lines_covid.pdf
    • https://cdn.sqhk.co/kogoruzojif/iifhjij/svg_color_fill_online.pdf
    • https://cdn.sqhk.co/daxerarugak/gfliajc/president_2020_election_odds.pdf
    • https://cdn.sqhk.co/sewadokoka/gvSaAd3/fold_up_bike_electric.pdf
    • https://cdn.sqhk.co/xeviremal/5jdOjjP/2020_solar_eclipse_path_map.pdf
    • https://kutawujotin.weebly.com/uploads/1/3/4/0/134016956/8ede1aa5.pdf
    • https://cdn.sqhk.co/gotoruzud/fihghHj/monumorome.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000ec1c.bin
e2aa38c722eb281a873112849ffa336174b8b1dfcdfbb2437204d8bf48f6cac6
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1C 4856 bytes
font_01_sfnt_off0000fcab.bin
cfae3294ecefe3d26223cf323683dc461ee59f2f3d480763f24bc15d735eb33e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAB 10228 bytes