Malicious PDF — malware analysis report

Static analysis result for SHA-256 3924a401b682e0fe…

MALICIOUS

PDF

112.9 KB Created: 2021-04-05 10:36:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54439745020e68dddf2b6279f30b75ea SHA-1: d5447ecb7aaaa9c6779da7cc1e97ee9ff9f05428 SHA-256: 3924a401b682e0fe4166a34febacd6cc3358c666a1693fde892a468af754cac9
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to a suspicious domain ('jacksth.ru') that is likely used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristic firings suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jacksth.ru/123?utm_term=hypothesis+testing+exercises+with+answers
    • http://xrootunited.com/41962016874mivpp.pdf
    • http://premiumpornclips.com/vezafera6xyg.pdf
    • http://cardioactiveufficiale.site/54806444981q8a4u.pdf
    • http://ninotekega.mygamesonline.org/motor_vehicle_bill_of_sale_texas.pdf
    • http://dunewewibi.22web.org/character_creator_3_full.pdf
    • http://modernstyle.pro/exercise_scoliosis_treatmentruv26.pdf
    • https://matatotasewitux.weebly.com/uploads/1/3/1/3/131384286/86359e2cc1576aa.pdf
    • https://levalezekavazif.weebly.com/uploads/1/3/4/6/134639406/sijujutolivejizi.pdf
    • http://pearhaidhr.fun/inner_child_guided_meditation_scripte4dmy.pdf
    • https://wunovolal.weebly.com/uploads/1/3/5/3/135311751/f16c73.pdf
    • https://dimenitajobe.weebly.com/uploads/1/3/4/4/134444553/puvepinade_gazodejelekepo_sokigofuwiwe.pdf
    • http://kexufiloruruki.22web.org/hantek_dso5102p_digital_oscilloscope_manual.pdf
    • https://nuwofukejixi.weebly.com/uploads/1/3/1/4/131437867/tanimetuzebunutote.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0b007e7f-4b67-4701-a47b-4b7958a264ca/the_vampire_diaries_logo_season_1.pdf
    • http://nurifedalezonu.rf.gd/pijimuxufixasag.pdf
    • https://uploads.strikinglycdn.com/files/94657e8b-032c-4117-92cf-a721ec3e1e82/87354340921.pdf
    • https://uploads.strikinglycdn.com/files/847d2994-bb2b-4005-a813-ceeb9c6bf9f6/gre_vocabulary_free_download.pdf
    • http://dipokufaso.epizy.com/zalakiwagez.pdf
    • http://lafatakijuton.epizy.com/80952002587.pdf
    • http://fuvuvadut.onlinewebshop.net/3583471081.pdf
    • http://wegajovekesowor.epizy.com/worksheetfunction_vba_sumif.pdf
    • https://uploads.strikinglycdn.com/files/098b2355-86a7-4b7b-b9b2-d86e6b4d140d/how_to_use_pioneer_bluetooth.pdf
    • 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_off000178ba.bin
81ac63df5fb36a0f3fc540ee5383b8b2599253eb42abcf3f332b8bf28f2d9ba8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x178BA 5388 bytes
font_01_sfnt_off00018b28.bin
b974a48e32c7bde16328e60b8b461651c1ad5d560661e25b49b16487e6f42110		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18B28 12488 bytes

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