Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8aa5dbf45b73d02…

MALICIOUS

PDF

82.9 KB Created: 2021-02-15 23:02:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: f3250fc55233e490386d87aa07ab39a4 SHA-1: 1c6264a9d34743e5f0bbea3f092c305d6e201a55 SHA-256: c8aa5dbf45b73d024f0ea9c26dd3c85efcbf1a6a0880ee8ae90502e92317f127
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a large number of external links pointing to other PDF files hosted on various domains, many of which appear to be disposable. This behavior is consistent with SEO link farming or a distribution mechanism for further malicious content. No scripts were extracted, but the PDF structure itself is leveraged to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • 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=libro+eva+luna+isabel+allende+pdf PDF link annotation
    • https://puzugisebo.weebly.com/uploads/1/3/1/4/131438758/nebagaju.pdfIn PDF document text
    • https://cdn.sqhk.co/noruwotil/Ogc3gfE/mp3_music_player_free_download_for_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452863/normal_600257bc16a7e.pdfIn PDF document text
    • https://cdn.sqhk.co/kizafizutuw/6ohhfig/69233820992.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484118/normal_5ffdb74bba14f.pdfIn PDF document text
    • https://cdn.sqhk.co/tumowara/vjdIhba/female_superhero_creator_game.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/RjauYiq/rush_limbaugh_health_update_august_24_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/8jt85ha/loopnet_san_diego_for_sale.pdfIn PDF document text
    • https://vusozegaxu.weebly.com/uploads/1/3/0/8/130874635/mukiwedetab.pdfIn PDF document text
    • http://ledy66.net/rpg_open_world_games_for_android_offlineavq5w.pdfIn PDF document text
    • https://cdn.sqhk.co/tefazaturar/jdhduic/free_movies_online_no_sign_up_2020.pdfIn PDF document text
    • http://introdom.ru/net_framework_2._0_vista_32_bitq7y3g.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/hchjhas/mlb_playoffs_2020_bracket_updated.pdfIn PDF document text
    • https://tuzafezinaxav.weebly.com/uploads/1/3/4/3/134319976/mijiwojil.pdfIn PDF document text
    • https://cdn.sqhk.co/manuguwe/OhbVhcQ/virus_protection_free_for_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/tedisebufen/ljdjcLO/85381054638.pdfIn PDF document text
    • http://stav-games.ru/internet_cafe_simulator_apk_indirsdl56.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476002/normal_5ffadb5e5d568.pdfIn PDF document text
    • https://cdn.sqhk.co/zasokolof/YqjfNhe/74192185192.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366661/normal_5fe17459364f1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AE 5176 bytes
SHA-256: aba97c270f40bbfda74001f5431b1a722b3f2782cba68ce4f29d65bcfa237ab0
font_01_sfnt_off0001035c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035C 11296 bytes
SHA-256: 80e273dc4a13c46ac5096f560e9e49cd731565c797d7f061b3e6620a027f82bd
font_02_sfnt_off0001284c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284C 16036 bytes
SHA-256: 52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550