Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6c743500214866d…

MALICIOUS

PDF

68.6 KB Created: 2021-04-06 15:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 65f395d1661b065252b96008649c43cb SHA-1: 8398edce068badf9f6562dd084755604e9e786d6 SHA-256: d6c743500214866d6ff39a8474ef603d760e92a3b70dbf4c62014e0f6a7060fc
246 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses brand-impersonation credential phishing. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://rekazisiw.weebly.com/uploads/1/3/0/8/130874265/tasorulepotobu_xaxadena.pdf.
  • 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://vilenefex.ru/wix?keyword=2004+mercury+outboard+specifications PDF link annotation
    • http://wiinorama.fun/1427307815urdqp.pdfIn PDF document text
    • https://rekazisiw.weebly.com/uploads/1/3/0/8/130874265/tasorulepotobu_xaxadena.pdfIn PDF document text
    • http://idealicacolumbia.site/46834796082d2oj4.pdfIn PDF document text
    • http://xivagoz.22web.org/ponniyin_selvan_movie_cast.pdfIn PDF document text
    • https://jesisime.weebly.com/uploads/1/3/4/8/134886507/sojadimu_monupabuter_geluwax_xafamazo.pdfIn PDF document text
    • http://rutenowataba.iblogger.org/11587970780.pdfIn PDF document text
    • http://fitokapss.xyz/866004137297con3.pdfIn PDF document text
    • https://ponegibafuzixi.weebly.com/uploads/1/3/1/4/131406662/nediluligajos-luxamazedeg-dijado-zusarobe.pdfIn PDF document text
    • http://luwogexejel.getenjoyment.net/lewufujinopefas.pdfIn PDF document text
    • http://grantmedica.ru/2008_four_winds_rv_owners_manual97m3r.pdfIn PDF document text
    • https://bavanakeburosot.weebly.com/uploads/1/3/5/3/135302165/3382528.pdfIn PDF document text
    • http://waxedeb.getenjoyment.net/ribajimakotem.pdfIn PDF document text
    • http://midikakuvekume.mywebcommunity.org/pogumumodunemapex.pdfIn PDF document text
    • http://sunmarkt.ru/dofafqypnf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2903667b-e544-4972-ac7f-e5855aaa9b37.filesusr.com/ugd/2cc660_c21499298f314fe89f402c4a130ecd42.pdf?index=trueIn PDF document text
    • https://9fbaa0db-fe9e-443e-b503-3d02ea494c21.filesusr.com/ugd/d417e9_ef6b65a02ddc41c2a72b9cc8c22be0e6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6040917f-28f8-4e91-9305-5b95b9bfb220/cycleops_fluid_2_manual.pdfIn PDF document text
    • http://towirasoruxapob.rf.gd/app_scanner_pro_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5d51cd1-bf8a-4ab1-9d4a-f26636c514b2/pipe_welding_contractors_near_me.pdfIn PDF document text
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_ba1b3dd86609499ea4af953027ff94f9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a54af57-722f-4dc2-9654-17d4fcf1dcc6/planewalkers_handbook.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_off0000cefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFA 5780 bytes
SHA-256: 70e99140e65783d29acfb7367579db34ef54f03d084ff4be8ba22957383c714a
font_01_sfnt_off0000e298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE298 10100 bytes
SHA-256: be0fdcc46843caf468d1175e8b0c187decdac5f3062103fe5692666955c35bd4