Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8cb086beba824c8…

MALICIOUS

PDF

77.3 KB Created: 2021-02-11 11:47:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 71053b587212b454799fb16a9654a01c SHA-1: 0bd4358d6953e7ccf6af8e401748cf7be3eab25b SHA-256: a8cb086beba824c80d55c27f1e4bca37eda96ba02add86790bd400d78b01fde7
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with one specifically identified as a lure for a "manual of style for contract drafting pdf". The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of multiple disposable domains and link farm heuristics further supports a malicious campaign.

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 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://druttle.ru/123?utm_term=a+manual+of+style+for+contract+drafting+4th+edition+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485005/normal_5fc93fb78a085.pdfIn PDF document text
    • http://kefikajutadab.22web.org/boy_story_album.pdfIn PDF document text
    • http://tuwedoviwe.iblogger.org/cyber_security_course_free.pdfIn PDF document text
    • http://dajumike.iblogger.org/laravel_carbon_date_format.pdfIn PDF document text
    • https://fezojobuxaboxo.weebly.com/uploads/1/3/1/0/131070559/redimevuf.pdfIn PDF document text
    • http://madusotiju.22web.org/corona_for_sketchup.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375509/normal_5ff11796c4802.pdfIn PDF document text
    • http://jijagigipijum.iblogger.org/50988824420.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367903/normal_602432a7778d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369493/normal_601fab210b39b.pdfIn PDF document text
    • http://nowijito.22web.org/parkour_maps_for_mcpe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gigolovumiguse.rf.gd/88038157230.pdfIn PDF document text
    • http://risuveliki.rf.gd/54814025678.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/icloud_login_android_browser.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/el_cajon_online_police_report.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/public_private_partnership_india.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_off0000efe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE8 5748 bytes
SHA-256: c7800d2b1cd363277a295fcd454d3fbaed253bd8d981302db60de47ee6d2146f
font_01_sfnt_off0001035c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035C 10524 bytes
SHA-256: 99030bd0b4f461e14ff421909162dbfefac95f7b6bb4a0e1ca47765a68c36cff

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