Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe33bb08d1ce1475…

MALICIOUS

PDF

84.3 KB Created: 2021-03-29 11:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0e3f78c48c65a86d7f0676d597d80462 SHA-1: 20e3cc6cb2ac457be12fe2b7b55b2874b64106d4 SHA-256: fe33bb08d1ce1475bd7cf378735a20c1e35727a38631e9f3bf11530ea35b42ec
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://mezovuduw.ru/wix?keyword=old+school+maplestory+cleric+guide PDF link annotation
    • https://cdn.sqhk.co/porosobof/gjgj7CY/70141802195.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391015/normal_5ffc5a05169bc.pdfIn PDF document text
    • http://shopsmmv.site/persona_4_golden_guide_booky9i18.pdfIn PDF document text
    • https://kekufekogaj.weebly.com/uploads/1/3/4/7/134768560/pupim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501482/normal_6021aef396aca.pdfIn PDF document text
    • http://life-news.tech/ejercicios_pronombres_posesivos_inglv4sn5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486772/normal_6013a2211b734.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374840/normal_5fc8ed557bb94.pdfIn PDF document text
    • https://cdn.sqhk.co/ramawuvade/Lgj95yu/sogerokilureson.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420438/normal_5ffe54776e716.pdfIn PDF document text
    • https://zosafetudosejo.weebly.com/uploads/1/3/4/6/134670517/wakekud.pdfIn PDF document text
    • https://nigelatadumave.weebly.com/uploads/1/3/4/6/134615228/066a14c94.pdfIn PDF document text
    • https://cdn.sqhk.co/vakolitakap/bENOqaS/kaiser_pharmacy_fresno.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/6jfgdaZ/jutifekatuf.pdfIn PDF document text
    • https://cdn.sqhk.co/maxegugej/gcggFjO/9595882705.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/limewub/xisulejesitima.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/pavitra_bandhan_serial_title_song.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/19538661747.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/rca_tablet_charger_target.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxefemebidaz/cub_scout_logo_high_resolution.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_off00010a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5C 5616 bytes
SHA-256: ba1a55c53ba714aa312d818a578bfb6f973f06fe815c93a914bfd74c7dbcaaeb
font_01_sfnt_off00011d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D48 11388 bytes
SHA-256: bdf7519ada11050a8c083ac1530619d57c2cded0cf5df89db1371dc5309e5a53

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