Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9d0161bf3181df8…

MALICIOUS

PDF

69.0 KB Created: 2021-03-13 23:08:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca9530c1fb7eb86fa0e79685c115a492 SHA-1: 55f9846ef0bf438b1eb4808971e554982a758615 SHA-256: c9d0161bf3181df8133f6eff7f308480dfae00b301cdf85b0b81a674d21a1584
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, indicating a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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
  • 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://botokaw.ru/award?keyword=a+case+study+on+leadership+pdf
    • https://cdn.sqhk.co/rotuzuwibi/iijixgh/gravity_definition_physics.pdf
    • https://static.s123-cdn-static.com/uploads/4482002/normal_5fcad6a24df4a.pdf
    • https://tuvuneboginat.weebly.com/uploads/1/3/1/6/131606819/bobipisanuri_sibewajiwewuwa.pdf
    • https://dogigivemo.weebly.com/uploads/1/3/4/5/134515387/53b135e6a4.pdf
    • https://salabupomisopef.weebly.com/uploads/1/3/4/6/134631393/gelomutumijam.pdf
    • https://static.s123-cdn-static.com/uploads/4427080/normal_5ff1f5a5c65c1.pdf
    • https://static.s123-cdn-static.com/uploads/4409614/normal_5fcc998eac106.pdf
    • https://mivebomuponi.weebly.com/uploads/1/3/1/3/131398008/b6b584c3.pdf
    • https://cdn.sqhk.co/dutudovajud/wfS4Ggj/miralax_side_effects_mayo_clinic.pdf
    • https://cdn.sqhk.co/tumowara/6LUG8pq/my_talking_parrot_apk.pdf
    • https://cdn.sqhk.co/gudupiziv/ivhhfie/list_of_asean_countries.pdf
    • https://cdn-cms.f-static.net/uploads/4489586/normal_5fe6a301c4a60.pdf
    • https://cdn.sqhk.co/fusevesapime/icNCSOZ/the_family_chantel_cast_instagram.pdf
    • https://cdn.sqhk.co/parikozug/cgdgdio/earth_asteroid_collision_simulation.pdf
    • https://cdn.sqhk.co/muluxodipoto/aeGjh4m/pinout_cable_usb_iphone_4.pdf
    • https://cdn.sqhk.co/fedefuxu/Edhbjia/the_silent_age_game_wiki.pdf
    • https://cdn-cms.f-static.net/uploads/4369183/normal_602c6c24e609f.pdf
    • https://setixifofu.weebly.com/uploads/1/3/1/6/131606861/jumesetikata.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4e7e6bf9-fe8b-4245-8613-80e4f7097c29/napobijidinadaxorefa.pdf
    • https://uploads.strikinglycdn.com/files/56805de2-72fd-4ecb-a9ff-74ad5a1480a2/how_do_i_renew_my_licence_at_70.pdf
    • https://uploads.strikinglycdn.com/files/e6a5fb9d-c653-468f-bc15-b89cfb0f8709/marakivapuperetinulifoni.pdf
    • https://uploads.strikinglycdn.com/files/46b254ab-4916-4e9b-9f76-25ecbf6534b2/where_is_acurite_located.pdf
    • https://uploads.strikinglycdn.com/files/b7c19592-a9cd-489e-a9f9-921de049788c/how_to_increase_ancillary_revenue.pdf
    • http://dexifuv.epizy.com/5614683750.pdf
    • http://varoniwarovez.rf.gd/kuloboz.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_off0000d2b1.bin
a72c15c230e403e5fae514655ea6b0666ea9578ed955bb1852a8c5412dd65a09		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B1 5336 bytes
font_01_sfnt_off0000e4db.bin
2cd967d5ec5f0d3ae2e48c770d6a72d42275255d8f6050e71ae0e6840cc89516		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DB 10012 bytes

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