Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9a6edcd9119da22…

MALICIOUS

PDF

92.2 KB Created: 2021-04-03 07:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5cdb2bf2eaca98df44e2d3904b4fe0da SHA-1: 20f9573356b23a0bdb5cd79dc4330e52a2a783f5 SHA-256: d9a6edcd9119da22805c9d732074f16e582328e68119cf03455db07653b9ef17
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or tracking mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/strik?utm_term=what+intermolecular+forces+are+present+in+h2o2 PDF link annotation
    • http://gipovasota.sportsontheweb.net/sobafesakapiro.pdfIn PDF document text
    • http://kivudutamazawan.22web.org/xazubakivepisikuzanugawu.pdfIn PDF document text
    • http://rujewazaxijaza.sportsontheweb.net/8644931596.pdfIn PDF document text
    • http://zagozogenef.sportsontheweb.net/sleep_sense_book.pdfIn PDF document text
    • http://xeniveperovabef.sportsontheweb.net/german_arciniegas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414358/normal_601fd452b4c4e.pdfIn PDF document text
    • http://jorodija.iblogger.org/kopowopat.pdfIn PDF document text
    • http://keribek.22web.org/28176984782.pdfIn PDF document text
    • http://sivesesugipode.scienceontheweb.net/automatic_room_temperature_control_with_security_system.pdfIn PDF document text
    • http://zakewabo.scienceontheweb.net/tidufogaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366033/normal_603e2236c9eeb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suwinateno.epizy.com/grammar_english_to_tamil.pdfIn PDF document text
    • http://xiwozoget.atwebpages.com/luposaxewowere.pdfIn PDF document text
    • http://pemadoludapi.rf.gd/how_to_speak_good_english_fluently.pdfIn PDF document text
    • http://welokisixipapa.epizy.com/35812818702.pdfIn PDF document text
    • http://sipawas.epizy.com/27764045953.pdfIn PDF document text
    • http://gerinaselamezos.rf.gd/60586123780.pdfIn PDF document text
    • http://xodepew.epizy.com/94286998063.pdfIn PDF document text
    • http://welemup.rf.gd/anne_marie_friends_songs_free.pdfIn PDF document text
    • http://xebizeluzifavi.rf.gd/wonepunaru.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_off000124a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A1 5400 bytes
SHA-256: 8de2b0747a29e89cbac9b3b4d39de5568d1b49831f506fd446013c7620e19b0f
font_01_sfnt_off000136e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E7 12732 bytes
SHA-256: faccb0afa10ca6b8ca1c9f14c279d72f13aac62ce4798066e99ebb549dcdb8d6

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