Malicious PDF — malware analysis report

Static analysis result for SHA-256 9338201803d53947…

MALICIOUS

PDF

126.3 KB Created: 2021-03-20 15:37:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7b92120befc48db5061b554a1428810 SHA-1: de23b28af90046053eb8a9f270522a6ca8ef6d54 SHA-256: 9338201803d53947bf5fa4fcb77cdbd270e8b498c86466bd725c51d89fe7007b
234 Risk Score

Malware Insights

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

The PDF file contains numerous links to external PDF files, suggesting a link farm designed to distribute malware. The presence of a 'download button' lure and instructions for a password-protected archive further indicate a malicious intent to trick users into downloading and opening malicious content. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 8

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/strik?utm_term=dell+optiplex+9020+wifi+drivers+windows+7+64+bit
    • http://vivebax.iblogger.org/sobre_el_anarquismo.pdf
    • https://cdn-cms.f-static.net/uploads/4409806/normal_60292f9aee3b5.pdf
    • http://nuwiratuzitezep.22web.org/losepobemowigez.pdf
    • https://wimegipovuxu.weebly.com/uploads/1/3/4/3/134373819/zebuxesevegojub_nexegof_pemimugumivox.pdf
    • https://cdn-cms.f-static.net/uploads/4447267/normal_604d1fbc742a1.pdf
    • http://bukawavado.medianewsonline.com/ralepokoxexokedaga.pdf
    • https://nawolokiwepona.weebly.com/uploads/1/3/2/8/132814855/34e93a78fb1af08.pdf
    • https://static.s123-cdn-static.com/uploads/4459034/normal_5fc9403c52f65.pdf
    • https://sebanibukuj.weebly.com/uploads/1/3/4/3/134354661/tetadi.pdf
    • https://pitulero.weebly.com/uploads/1/3/2/6/132683003/f84525db14f401.pdf
    • https://bogonifad.weebly.com/uploads/1/3/4/1/134108647/vetugepawu_judevol_rikumelezula.pdf
    • https://cdn-cms.f-static.net/uploads/4380522/normal_60342bf2612dd.pdf
    • http://wegaturagifo.getenjoyment.net/autocad_2d_tutorial_2020.pdf
    • http://zeboxagekej.sportsontheweb.net/18690247836.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://67258aaf-84c5-4a88-bfd2-1aa7ddb6c27a.filesusr.com/ugd/850f07_896961eaa59e4567af6a41faf0cd7bb8.pdf?index=true
    • http://lirolisol.epizy.com/ditanewevosobevikivatixuw.pdf
    • https://s3.amazonaws.com/zumomasugipeno/vumoleruxuzube.pdf
    • https://s3.amazonaws.com/kewakuko/nejakideme.pdf
    • https://s3.amazonaws.com/panalipolifod/chinese_dragon_vector_free.pdf
    • https://667b589a-70dd-4c78-a03f-47f6e9f07b1f.filesusr.com/ugd/db80c5_b658ecbadb6b4ff4bb47bf793231846d.pdf?index=true
    • http://jupegojut.atwebpages.com/10137312945.pdf
    • https://s3.amazonaws.com/dapekufoxiraku/how_to_replace_craftsman_garage_door_opener_belt.pdf
    • https://951e66c5-660f-4748-bfcc-a6cc0831133d.filesusr.com/ugd/4967bb_ad82e714155d4da8a3677e9b35a685df.pdf?index=true
    • http://gutuneze.rf.gd/gosup.pdf
    • https://cd29ef07-728f-4a0b-b57b-23e770395c36.filesusr.com/ugd/f14cf6_e1b46a0f9d8246769a12c68a272dfbf7.pdf?index=true
    • http://xejonitofopim.epizy.com/bhaktamar_stotra_lyrics_free.pdf
    • https://s3.amazonaws.com/tedowafomaru/87883883503.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_off0001b154.bin
6249f72e6ef9261697d998b507d842eae581b03bd390022f149e79fd7bcdc0cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B154 5936 bytes
font_01_sfnt_off0001c5bd.bin
bc10695dc8ccd53a2f9465085c020c188ad909da0767e22a039325a9a1ca6ef8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C5BD 11248 bytes