Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae4fab969ec850de…

MALICIOUS

PDF

79.2 KB Created: 2021-04-12 10:36:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7e1e3e2dfffc3714f78c16aef14c6fb4 SHA-1: 463907c0c7b1d1f59363a20adc557d9e3b0c605c SHA-256: ae4fab969ec850de3582833e9be7fb10b763e2ae473332475fe6855a467c9641
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 0.9990

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/strik?utm_term=how+expensive+is+corian+worktops PDF link annotation
    • http://sallehub.xyz/6239247135jnxk1.pdfIn PDF document text
    • http://zoom-omsk.ru/15085916821gr7ek.pdfIn PDF document text
    • http://cenderaoriginator.com/18766390880c5sxz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477409/normal_5fce2bb9b3272.pdfIn PDF document text
    • https://cdn.sqhk.co/gotirawuz/hdiifYu/zombie_sniper_last_man_stand_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/wotudasigeb/jggiCic/xaxiginuke.pdfIn PDF document text
    • http://frontglass.xyz/building_monomers_of_macromolecules_lab_answer_keyhy2vk.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/ibiejeZ/bilatodupag.pdfIn PDF document text
    • https://cdn.sqhk.co/tewokozogop/6wzgeij/65744034945.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376612/normal_5fc5a0f3b5924.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406775/normal_5ff08d4fa100d.pdfIn PDF document text
    • https://cdn.sqhk.co/dowepigakaw/jhpjgGR/water_sort_puzzle_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d775cbd9-2bdd-4481-a696-04503b1c06de/what_does_the_bus_ticket_represent_in_a_streetcar_named_desire.pdfIn PDF document text
    • https://34886cf3-15ed-44db-93e8-8979dc7c4cd7.filesusr.com/ugd/ea2c45_bf21e4f95d144dacb5db46399496e005.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/38f11323-7f45-4315-b327-406fe6797fa8/38480116244.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2797551-833c-4d1f-a807-d7db91a82ae5/lufodawizugifabafu.pdfIn PDF document text
    • https://68420551-d949-41c4-975b-2ae86aa6d062.filesusr.com/ugd/09c3c7_becc0d41b5db4463999adf7f387428e1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dbb4313-3e20-4161-a8b5-238c9d9acf9e/tintin_the_castafiore_emerald_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc389b5a-64af-4350-81bd-86b8a34b913b/anderson_am-15_no_logo_lower_receiver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7391cc3-44c8-426e-b835-cbe5fdb6baec/relozewifa.pdfIn PDF document text
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_af8f6fa791d34e278e70f5b699231c9a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cc08ca2-9ffe-40e8-8f76-67cbcc264eee/85125850019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0672fee7-7516-45fc-8cd8-a455d7ed1622/42012893482.pdfIn PDF document text
    • https://7a579b3f-ce96-4c66-abdc-991530493d29.filesusr.com/ugd/010c6b_c09c24941b7b4fb09b7d4f6f345e535f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f982727-a7d3-4878-8701-d679c4044b97/2003_honda_odyssey_transmission_rebuild_kit.pdfIn 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_off0000f831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF831 5140 bytes
SHA-256: 24aaff5ceb3b88a0c8732d79c972bc3f9528e31433f7521629d7dcdef9de1f30
font_01_sfnt_off000109d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D6 10864 bytes
SHA-256: d986368a4aea0cd4343901e9dd363cc9ac621e8b68795bc5afa46574e462a741