Malicious PDF — malware analysis report

Static analysis result for SHA-256 72b17b102ca801c5…

MALICIOUS

PDF

76.3 KB Created: 2021-03-21 05:16:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f285c7d2ff15f77c0bb53bc8ea76cdb9 SHA-1: 0564ae4825320f9764300f8115b7e65a5ea010ab SHA-256: 72b17b102ca801c5935ba630cdcebdc0f2c4f1b713db090d435f4e4b183eb593
184 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9746

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 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.
  • 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
  • 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://zajinet.ru/award?keyword=non+aromatic+compounds+pdf PDF link annotation
    • https://cdn.sqhk.co/vabalogu/jjgi4du/vuxaxapipuraza.pdfIn PDF document text
    • https://cdn.sqhk.co/risubibasero/Tgcgdoq/dr._mario_world_738.pdfIn PDF document text
    • https://cdn.sqhk.co/botonerepap/jjeibuv/mifove.pdfIn PDF document text
    • https://cdn.sqhk.co/rorefevobo/dDMieif/spaceship_shooting_game_3d.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/fieVMhc/wurigoximagarilulasewok.pdfIn PDF document text
    • https://cdn.sqhk.co/vovusupa/qK8mibh/rambo_3_special_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/sakiforivona/Z8y9yhd/zoguwabalogemewe.pdfIn PDF document text
    • https://cdn.sqhk.co/xasomegupur/jfjghit/green_ringtail_possum_evolution.pdfIn PDF document text
    • https://cdn.sqhk.co/wevexifimur/gcheYie/alienware_desktop_reviews_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/dakuwuwuzije/gjgwi0h/82868382981.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxabofapuw/3a1ghGc/city_building_games_xbox_360.pdfIn PDF document text
    • https://cdn.sqhk.co/nowavutu/hjgfjhA/67067909260.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://34e51215-b586-4e01-b3ea-a219475a7b91.filesusr.com/ugd/46481b_0e8cdb32ae1d43a9806de3b3feb1e35b.pdf?index=trueIn PDF document text
    • http://gukuwet.epizy.com/zemanasafej.pdfIn PDF document text
    • http://memokikadu.rf.gd/7391601309.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/diamond_infinite_edge_pro_bow_parts.pdfIn PDF document text
    • https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_17ef9dc0aedd4d3f94b11ee7373d46a8.pdf?index=trueIn PDF document text
    • http://repefewuvu.epizy.com/barron_s_ielts_superpack_2nd_ed.pdfIn PDF document text
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_bc4cc3a21b8c44d39ae6cc385952955c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jozaponi/android_recyclerview_onclick_get_item.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/towapi.pdfIn PDF document text
    • https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_782076866bdb459e86ae18b39997d062.pdf?index=trueIn 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_off0000ea52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA52 5240 bytes
SHA-256: 2cf837d029f988c89ae5d2be2bc5c369a8d396941f49865f0a0909b9ef845ded
font_01_sfnt_off0000fc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC11 10828 bytes
SHA-256: 73c9371fda9fad72c63a2b117750f540b5b9d3fff0644967934b2ccb724206e8

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