Malicious PDF — malware analysis report

Static analysis result for SHA-256 64bff9fd26e65136…

MALICIOUS

PDF

88.5 KB Created: 2021-03-29 01:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 25dcf6631d2f23e124b6669285246ee0 SHA-1: c09245d76b75d0960e1608dc54ed3af6e8b66433 SHA-256: 64bff9fd26e65136b36726c30026a95fd698895e5334ff874543a2d15580cea8
134 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs, with one specifically pointing to a suspicious domain ('vilenefex.ru') that is likely part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, further supporting a malicious intent. Although no scripts were explicitly extracted, the presence of external links and the ML classifier's high confidence score suggest the document is intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vilenefex.ru/123?utm_term=cinebench+r15+64 PDF link annotation
    • http://telozurilesojo.sportsontheweb.net/blendtec_blender_recipe_book.pdfIn PDF document text
    • http://komaxinatobofe.medianewsonline.com/cfa_exam_paper.pdfIn PDF document text
    • https://botiwugagow.weebly.com/uploads/1/3/1/8/131872238/werurur.pdfIn PDF document text
    • https://jesisime.weebly.com/uploads/1/3/4/8/134886507/886b328.pdfIn PDF document text
    • https://nunewefumeko.weebly.com/uploads/1/3/4/3/134307525/sepobuzik.pdfIn PDF document text
    • http://poxumanavofeboz.scienceontheweb.net/67838313092.pdfIn PDF document text
    • https://porepegozid.weebly.com/uploads/1/3/6/0/136050151/4973648.pdfIn PDF document text
    • http://nuvotana.22web.org/62066606720.pdfIn PDF document text
    • https://fulimutalez.weebly.com/uploads/1/3/4/5/134599943/xutaz-sozukosovo.pdfIn PDF document text
    • https://vebupefipi.weebly.com/uploads/1/3/4/4/134497137/pofusij.pdfIn PDF document text
    • https://ranaxeli.weebly.com/uploads/1/3/4/4/134478161/9648763.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://napalujimawoz.rf.gd/how_to_replace_kenmore_elite_dryer_door_latch.pdfIn PDF document text
    • http://sulijugofogim.onlinewebshop.net/63210739696.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3b8b5f9-e840-4968-91cf-380815b66666/9381994277.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e99c9c31-d494-4605-9456-62e2a44514f1/what_are_community_relations_bureau.pdfIn PDF document text
    • http://totakes.rf.gd/tojedutaf.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/42005831743.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c13cf76-4f00-4f36-88f4-1bdda5203f2c/55188796589.pdfIn PDF document text
    • http://mukovixajetunex.epizy.com/sales_and_marketing_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/tukojixo.pdfIn PDF document text
    • http://kibululugavi.epizy.com/bulimia_y_anorexia_en_argentina.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/tedufasakojepani.pdfIn PDF document text
    • http://wegorabeg.atwebpages.com/awlad_haretna.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10994 4928 bytes
SHA-256: abd0330f9cc470094719975d15968a77c7be5270f1419e8715f1581540a6f889
font_01_sfnt_off00011a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A60 10996 bytes
SHA-256: 8c633b53f6e1647c43127ec4bded4a2b7a30ec5f2bd12adbb9b885be8bad773a
font_02_sfnt_off00014006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14006 16060 bytes
SHA-256: 3a6190b9c75d8e253a4a9753107ff097c16d628099f9ded6569ad601f166e76b