Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcbd357e0f56eb10…

MALICIOUS

PDF

73.4 KB Created: 2021-03-09 23:15:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 094aa443239172b7d29674b4f73fcd1d SHA-1: dcbd4494c311c12dc32a60cd9eee27d42d66ec8d SHA-256: bcbd357e0f56eb104ab6e677fa280c7b7d5d07977c0f7a048149a0be13dec107
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 as a phishing or trojan variant. It contains numerous embedded URLs, with one prominent URL pointing to 'ponafet.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host many links on disposable domains, further supporting its use as a lure.

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://ponafet.ru/wix?keyword=criss+cross+in+the+wrong+direction PDF link annotation
    • http://zipubezexupoka.mywebcommunity.org/sharp_xe-a207_cash_register_programming.pdfIn PDF document text
    • https://cdn.sqhk.co/gafisasiwu/igZgiUp/paramajaliga.pdfIn PDF document text
    • http://zomuregunaradu.iblogger.org/employee_application_form.pdfIn PDF document text
    • https://musisemikalig.weebly.com/uploads/1/3/4/6/134694348/ruletesorezapun.pdfIn PDF document text
    • https://cdn.sqhk.co/wafifovuwel/gfiaYia/fish_runner_rug.pdfIn PDF document text
    • https://cdn.sqhk.co/mugukawi/jsBSijL/dupotovosiparasove.pdfIn PDF document text
    • http://rowowevu.mypressonline.com/xiderunanibokabewaje.pdfIn PDF document text
    • https://rokudula.weebly.com/uploads/1/3/4/0/134017654/bivobupa.pdfIn PDF document text
    • https://jalizirut.weebly.com/uploads/1/3/5/3/135308553/mowan.pdfIn PDF document text
    • https://tewabigonin.weebly.com/uploads/1/3/4/7/134760563/0e8641fbbcb.pdfIn PDF document text
    • http://fanisore.sportsontheweb.net/platicas_prebautismales_cuauhtemoc_chihuahua.pdfIn PDF document text
    • https://wutejaguruloz.weebly.com/uploads/1/3/1/8/131871665/f4bcba3c6.pdfIn PDF document text
    • https://puzejiwitamino.weebly.com/uploads/1/3/1/4/131453698/ramarojomajon_dasopimapu_guwax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/36193450-d5a3-46b4-9ada-321570676d8a/wuremipowexofuzozikilu.pdfIn PDF document text
    • http://taguminuligifis.rf.gd/penatalaksanaan_pneumonia_pada_anak_menurut_who.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5a8a224-359a-4b18-8b4d-3576691e0e67/2234935506.pdfIn PDF document text
    • http://vogojitipam.epizy.com/tuvuriwamogidasawuganukaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/735d0d6b-0cec-4c54-b8f5-e387a22d73ea/45490650766.pdfIn PDF document text
    • http://wotofuwib.epizy.com/6931334236.pdfIn PDF document text
    • http://lozisuvuxinosog.epizy.com/health_hygiene_and_sanitation.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_off0000e144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE144 4956 bytes
SHA-256: 5cf369bb049c5f2fea38e2b77dcac981f23890ef477b5e98bc7f603763072c4f
font_01_sfnt_off0000f22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22F 10660 bytes
SHA-256: d2f0bf6c8c4af0912b90a78401cdd90fed5ce9980d9ae95131cc28f582a2ba95

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