Malicious PDF — malware analysis report

Static analysis result for SHA-256 815c6ddc230e0a9c…

MALICIOUS

PDF

81.9 KB Created: 2021-04-17 11:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 81374e2ee8ec64440cc266c58ebecf08 SHA-1: 9f152a5ab72a945736ac43fc5ff3e1baf0be9002 SHA-256: 815c6ddc230e0a9c1eadcde64d99969e2764a438c3797871c382ee7f90b6c3ad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9964

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 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://baarspo.ru/strik?utm_term=what+percentage+of+cocoa+makes+dark+chocolate PDF link annotation
    • http://saxobupazes.sportsontheweb.net/how_many_years_can_you_go_to_jail_for_prostitution.pdfIn PDF document text
    • http://vurejowug.mypressonline.com/how_to_bypass_washer_lid_lock.pdfIn PDF document text
    • http://gadivawiw.sportsontheweb.net/kekabeponuja.pdfIn PDF document text
    • http://mafejaruvoje.sportsontheweb.net/ashrae_handbook_fundamentals_1997.pdfIn PDF document text
    • http://verifybadgehelp.com/firefox_apk_for_jio_phonemhj30.pdfIn PDF document text
    • http://introdom.ru/android_xml_bitmap_sizeckt9a.pdfIn PDF document text
    • http://bijukexamova.scienceontheweb.net/english_business_letters_download.pdfIn PDF document text
    • https://cdn.sqhk.co/guvevifowo/7iglgez/fadebevaxesepo.pdfIn PDF document text
    • https://cdn.sqhk.co/zafilivopupu/jcnxhaY/asos_size_guide_tall.pdfIn PDF document text
    • http://korixoludofuguk.scienceontheweb.net/wild_animals_images_with_names.pdfIn PDF document text
    • https://cdn.sqhk.co/konajera/gegbih9/nascar_heat_mobile_mod_apk_3._2._60.pdfIn PDF document text
    • http://dipenoguzel.sportsontheweb.net/viwamulajidiwerufokabuki.pdfIn PDF document text
    • https://cdn.sqhk.co/risafapiven/iGXqGjd/free_adobe_after_effect_wedding_template.pdfIn PDF document text
    • http://getplafond.xyz/seroxabumiruj2fae.pdfIn PDF document text
    • http://waparudadip.mywebcommunity.org/gifojewulu.pdfIn PDF document text
    • http://ziwusis.getenjoyment.net/amrita_pritam_books_punjabi_download.pdfIn PDF document text
    • http://aycotoro7.xyz/ethics_and_the_limits_of_philosophyamgr6.pdfIn PDF document text
    • http://vibolofisef.mywebcommunity.org/vazotofowogotutemixisuva.pdfIn PDF document text
    • https://cdn.sqhk.co/tamejenonisi/zgifhgi/lunar_battlegrounds_ghost.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_11851f33e37c40a0acf37342cc722a3b.pdf?index=trueIn PDF document text
    • https://b564fea6-732e-489f-a029-a72dc6590de2.filesusr.com/ugd/6a4619_a91768d676094b9f97a5e1ab505a873e.pdf?index=trueIn PDF document text
    • https://95043331-d9de-4498-ad98-35b8ac3ee23f.filesusr.com/ugd/5740b2_39a6d6eb6e054915b779b58b586fe1f2.pdf?index=trueIn PDF document text
    • https://b5c90759-dbf8-4ccd-b12d-e23c958527f9.filesusr.com/ugd/915a55_bdcd06c5d94d4c82894b6d1f4a77406e.pdf?index=trueIn PDF document text
    • https://bb209e34-24c3-4901-88bd-c00af8cda710.filesusr.com/ugd/de6798_496d2d0ffddf4b7fbc689783a2d0f619.pdf?index=trueIn PDF document text
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_b07b0ee850ef4c9bb8cad7fe97fa565c.pdf?index=trueIn PDF document text
    • https://5e3b32e6-a537-4a58-a531-ef303a468713.filesusr.com/ugd/120874_a3172b02a8464dd7aa39ce1f32364ab3.pdf?index=trueIn PDF document text
    • https://0306adf0-382e-42f1-903d-71c3961c97f1.filesusr.com/ugd/7ff653_88ab4432c7554785802811cabbd25993.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_off000100ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CE 5648 bytes
SHA-256: 3edb2d31a84ed6dd8fa56fc2817cbf71ef558884f61cc13d6acbaba2ab63f9e2
font_01_sfnt_off000113e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E6 11284 bytes
SHA-256: 1fb10c254232b770a840e437c5a2247404c8ac9bc0e7074a292a454a51ba982b