Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef4b82e5e8847d6…

MALICIOUS

PDF

109.4 KB Created: 2021-03-10 19:24:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 694845006d42a0684d9fa38cde5b7a1c SHA-1: 9cf24f9d5702dccfc27d080eb0ae5572ab2ab80e SHA-256: aef4b82e5e8847d6791aeef142c3e45fce47e1b6ee9b4d198e894e128d0d9f9e
186 Risk Score

Malware Insights

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

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 0.9976

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://mezovuduw.ru/aws?utm_term=scottish+rite+masonic+ritual PDF link annotation
    • https://cdn.sqhk.co/zoravuzulop/gjajXgd/56288552410.pdfIn PDF document text
    • https://wafanipo.weebly.com/uploads/1/3/2/6/132695839/2552149.pdfIn PDF document text
    • https://togolotokafusaf.weebly.com/uploads/1/3/5/2/135294136/2babc0a936f.pdfIn PDF document text
    • https://cdn.sqhk.co/foxoxaze/geLYDuO/85225183945.pdfIn PDF document text
    • https://cdn.sqhk.co/raxuzuvuluf/cpRcndX/zepasiwedibot.pdfIn PDF document text
    • http://puxefesezosowej.22web.org/xiwowemurokeg.pdfIn PDF document text
    • https://seporarutigofu.weebly.com/uploads/1/3/2/7/132741198/fijeguviwoxifu_supijus.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/2bjgjgi/purixatotodenagova.pdfIn PDF document text
    • https://minunelojob.weebly.com/uploads/1/3/1/4/131453060/savagu_kijukuzenawo.pdfIn PDF document text
    • https://cdn.sqhk.co/nemuvefik/uhd6usv/52264974951.pdfIn PDF document text
    • https://cdn.sqhk.co/vagofedewat/Kieiab2/cooking_jam_craze_restaurant_chef_cooking_games.pdfIn PDF document text
    • https://sinegaxoxu.weebly.com/uploads/1/3/4/4/134462527/4270141.pdfIn PDF document text
    • https://cdn.sqhk.co/kagelemovo/jgGBidQ/cut_rope_rescue_puzzle_3ds.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bulujono/70431195280.pdfIn PDF document text
    • https://s3.amazonaws.com/vanatul/81562975016.pdfIn PDF document text
    • https://02796127-04ec-4c85-b270-c6f7310ebb18.filesusr.com/ugd/ce0e6d_a0536e84f370450f8a0a4dadf1f5e386.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gimisorixosu/street_fighter_apk_android_2._3.pdfIn PDF document text
    • http://wezikadedikenev.epizy.com/40222243184.pdfIn PDF document text
    • http://pibamifa.rf.gd/pikebebotijutin.pdfIn PDF document text
    • https://cd753cf5-d90a-4073-9c55-931a76e81761.filesusr.com/ugd/8826df_96c7c78eb2f048eebcaaa0f0673ea85d.pdf?index=trueIn PDF document text
    • https://e216d865-ddc7-438b-99b2-64609380b1bb.filesusr.com/ugd/7ae8b3_9b4f812561504bec9b867ebeeb429073.pdf?index=trueIn PDF document text
    • http://xosekipile.rf.gd/shift3_light_blast_projector_help.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/bohemian_rhapsody_sheet_music_alto_sax.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/ariston_armf125_dryer_manual.pdfIn PDF document text
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_0ab348c948ee40aaa1affb1d5d881b0a.pdf?index=trueIn PDF document text
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_c8443b7c429544c6b549ed3f4d810fb9.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_off00016eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EB9 5140 bytes
SHA-256: b8b49731bdd14dba239c15f5438f2024bf8e49a67f496c94288d7585e27c3dc7
font_01_sfnt_off00018000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18000 12620 bytes
SHA-256: 002004f313c4ac2dc1aa7e9c7ce91aa2d04a6780dd814743639480315674fdf4