Malicious PDF — malware analysis report

Static analysis result for SHA-256 8842192257beeb4d…

MALICIOUS

PDF

71.8 KB Created: 2021-03-21 00:55:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f4186fd6f2a5e1f84d9c1c64b5e2e653 SHA-1: 12dd53a4c76f1cfc44d04a094d220332e0482bc4 SHA-256: 8842192257beeb4ded85a18a0e3443b95a15498ae91f1df97a7c6e06e8d65600
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a clipboard-command (paste-and-run) lure. 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 0.9996

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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://gimoguvi.ru/123?utm_term=challan+form+aiou+pdf PDF link annotation
    • https://jetireduru.weebly.com/uploads/1/3/1/4/131453335/lejowu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391599/normal_5ff5842a226c5.pdfIn PDF document text
    • https://xegizotusubox.weebly.com/uploads/1/3/2/3/132303054/gebewovobelabotuwina.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410199/normal_600004c39d5b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501989/normal_6019753d334e2.pdfIn PDF document text
    • https://gulapekojikag.weebly.com/uploads/1/3/2/7/132741551/xuxefawewozu_naripaner_kuxasizis.pdfIn PDF document text
    • https://ketesepirexutub.weebly.com/uploads/1/3/5/3/135306065/vabaroja-lofovogurir-wutovekagiwal-dokabulon.pdfIn PDF document text
    • https://ruxunomitebapat.weebly.com/uploads/1/3/1/6/131606858/9569986.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/a6f478fe-46ad-4278-afe2-6a3d95a2c6d0/37224897126.pdfIn PDF document text
    • https://32e47638-7206-44c1-ad53-5c6f9176402e.filesusr.com/ugd/e00742_ca1570dc4c9e4d30bd016e4d2d3243f6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0698da67-159a-4db1-a55f-18133e33016a/sharp_ht-sb60_blinking_red_light.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edaade9b-9be7-4603-adf5-3bd7840bce23/rexolusuked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6b53f4a-d697-4dab-943f-d383f036c95b/why_is_the_picture_on_my_samsung_tv_dark.pdfIn PDF document text
    • http://jewezoku.epizy.com/united_reformed_church_religion.pdfIn PDF document text
    • https://665985ba-8e9f-4173-b993-17a3090d61d7.filesusr.com/ugd/08421c_b8d51a75f89c44ad92e9f9c83b4f300d.pdf?index=trueIn PDF document text
    • https://931f52e6-cb68-4a93-8e02-54808d33f8b6.filesusr.com/ugd/6290de_b1ff1faaa123498cae7e845d1bba7e55.pdf?index=trueIn PDF document text
    • http://duletufazipup.epizy.com/dugewa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daa42141-bddc-44b3-8d6d-a8ff6e401b8d/fupulabesux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb337e56-42d0-46b3-9e66-5b9c8f50115f/91779230154.pdfIn PDF document text
    • http://mudefikireneb.rf.gd/colorful_butterfly_logo_reveal_ii_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0908d155-f286-4f92-aa51-0544ece43f72/sig_p229_legion_review.pdfIn PDF document text
    • https://2863666b-9d79-467d-9aad-9eeb6dafbdf2.filesusr.com/ugd/6ee3eb_f0368047a04043eaaac21833d352b18a.pdf?index=trueIn 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_off0000dd31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD31 5008 bytes
SHA-256: ff174d5f4ae9e0ea938b0f4567d316edaec9fcb5c380ecee36404829eac1b8c6
font_01_sfnt_off0000ee0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0A 10060 bytes
SHA-256: bebbd0a91defcda5f2da87efa99942f30d83b6b8cac2d510e4317c01c2789585