Malicious PDF — malware analysis report

Static analysis result for SHA-256 c82a2f6e6edba817…

MALICIOUS

PDF

77.0 KB Created: 2021-05-15 23:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 561780dec7688a2a07acd76621fef30b SHA-1: 7c7fe9128abd9826f9074983f5f8c13f3c880343 SHA-256: c82a2f6e6edba817d1706787a9d70674150e1f2497b42d5edfc1b958a3d01e4f
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, characteristic of a link farm or phishing lure, with one prominent URL being zajinet.ru. ClamAV and ML classifiers strongly indicate malicious content, specifically identified as Pdf.Phishing.Trojan. The presence of embedded JavaScript, though not fully detailed here, suggests an attempt to execute malicious code or redirect the user to further malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=science+a+closer+look+grade+5+online+textbook
    • https://cdn-cms.f-static.net/uploads/4488570/normal_60182c599f104.pdf
    • https://wuduzavuvavazi.weebly.com/uploads/1/3/4/6/134618101/womutijobasu.pdf
    • https://bawoxuvebi.weebly.com/uploads/1/3/4/8/134886771/1f32f58.pdf
    • https://dujizajep.weebly.com/uploads/1/3/4/7/134704211/fugizunel.pdf
    • https://cdn-cms.f-static.net/uploads/4455890/normal_604b4903eb5b5.pdf
    • https://venunuwaxel.weebly.com/uploads/1/3/2/7/132740799/kafawenaji.pdf
    • https://cdn-cms.f-static.net/uploads/4485578/normal_6041e7b2a4037.pdf
    • https://cdn-cms.f-static.net/uploads/4367290/normal_60654fcda9140.pdf
    • https://cdn-cms.f-static.net/uploads/4385026/normal_6010b75103ae4.pdf
    • https://wimugedi.weebly.com/uploads/1/3/4/7/134725841/jukofenopabak.pdf
    • https://divowugu.weebly.com/uploads/1/3/6/0/136022164/nakuperopoz-ganule.pdf
    • https://gilurumujeluzem.weebly.com/uploads/1/3/1/8/131857598/1415706.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vujegojuxuwu.rf.gd/nipixibewomuzefa.pdf
    • https://uploads.strikinglycdn.com/files/4b676fc9-3dc2-4f1c-99d0-820680b61850/87212794735.pdf
    • http://fuwotimusajitos.rf.gd/98009305.pdf
    • https://uploads.strikinglycdn.com/files/07f8029a-2585-4ddb-b21b-c71193ca5b92/42344668170.pdf
    • https://uploads.strikinglycdn.com/files/99c10fb4-ce64-4b6b-b508-628be8f44e47/can_you_download_gta_on_xbox_360.pdf
    • https://uploads.strikinglycdn.com/files/86f10fc0-facd-471f-ab45-2a4ce2f8ebd3/36797141752.pdf
    • https://uploads.strikinglycdn.com/files/b81ed2b5-91ae-4b07-87c2-41aec1bbc472/transcendental_meditation_mantras_shirim.pdf
    • http://zekerivowula.rf.gd/sloan_flushmate_503_handle.pdf
    • http://lenixad.epizy.com/zarudezepefezuwaset.pdf
    • http://gozowivafano.rf.gd/blue_team_handbook_incident_response_edition_ebook.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_off0000ee02.bin
156e0df28bdc029519da0c9c6935db28ac3a7b2fb1493e92067235eaf3e9fd07		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE02 5604 bytes
font_01_sfnt_off00010125.bin
4a63923863cdde0c683adf19ba14ea844e5b175794eaf047bd141c485bbe7e6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10125 10884 bytes

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