Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeb0cd515643f2ce…

MALICIOUS

PDF

76.6 KB Created: 2021-03-14 01:49:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: bf6c90192c7af3eeb704ce3348bc910a SHA-1: 277964c00280834a9a738a6f6a9b43031e122f0e SHA-256: aeb0cd515643f2cee99eceec510bee55da28546069e4d60ab36b889c362bbf24
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 multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The document contains numerous embedded URLs, with one prominent URL pointing to 'jacksth.ru', suggesting a phishing or malware distribution attempt. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the malicious nature by indicating a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=the+half+has+never+been+told+book+review PDF link annotation
    • http://kexazejarufag.iblogger.org/22246483781.pdfIn PDF document text
    • http://reduslimitalia-ufficiale.site/alcatel_lucent_manual_8018pu3gs.pdfIn PDF document text
    • http://thiswaytovogue.com/mega_construx_game_of_thrones_battle_beyond_the_wallbzxzk.pdfIn PDF document text
    • http://ritual-venki.online/353472248079kjws.pdfIn PDF document text
    • https://cdn.sqhk.co/nokulebepoba/QdhjuPK/6797516091.pdfIn PDF document text
    • http://wildboost.club/55282119245feqk1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392453/normal_5ff49bed810ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427093/normal_601a33e8cafbd.pdfIn PDF document text
    • http://nextauto02.ru/rirukilobom64s5t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405930/normal_600c9ae8d1917.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417830/normal_6017a43a71036.pdfIn PDF document text
    • http://fisefer.22web.org/zupixupudujuvox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475863/normal_6037420418ae9.pdfIn PDF document text
    • http://psyhologrzn.ru/why_is_my_tv_screen_really_dimaafvu.pdfIn PDF document text
    • http://samelike.site/bengali_romantic_quotesqdigw.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwoxegolewa/bhijfoy/530_harris_loop_kingsland_tx.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/guwutivupudutu/xeximozimumumosisazinane.pdfIn PDF document text
    • http://kadanokadija.epizy.com/gagukenafowilikekibegu.pdfIn PDF document text
    • http://ruzoguniwu.epizy.com/dudufulutaxifiwudupobebo.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/jumisogimevobu.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_off0000ea58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA58 5300 bytes
SHA-256: 0fd96cd0e9b4146c4eeda04ebdfa10fe278dc2cc993d1b76a9e6e5af4d768f97
font_01_sfnt_off0000fc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6D 12056 bytes
SHA-256: 01258c4f7e0ee262105260e47edf36efe390c2019dad8330621380ac8a454cce

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