Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b86460e962c3d66…

MALICIOUS

PDF

75.5 KB Created: 2021-04-29 11:34:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 69ac8e1a3bbebf5754a1768ae5b63d59 SHA-1: d61bace2bcd442102e0097e87ba963d926e7a198 SHA-256: 5b86460e962c3d66e032c3198931ee0ac79b85592c4663aaf3a31fb00930d74e
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 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/strik?utm_term=sony+dcr-sx65e+specs PDF link annotation
    • http://mosomupusafebin.medianewsonline.com/dulatafopufefivosawedunu.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/fdd87ed8-db96-40dd-9856-b08ec06b98a0/58115840172.pdfIn PDF document text
    • https://8ca15cf9-c5bf-4329-906a-32df3c7b5ab7.filesusr.com/ugd/4ca7f5_c81cc4bd3cf4467794c56fe5212b5184.pdf?index=trueIn PDF document text
    • https://46d16763-6c5f-4e19-aa2c-3f4071fcbec2.filesusr.com/ugd/26f730_b9ff438fee7e49f2827355c7f8b4151f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/577730c9-c4ce-4cf3-9767-702e3ec8218b/what_is_faith_kenneth_hagin.pdfIn PDF document text
    • https://0df6220b-9630-4647-aab6-0d9db69b9d59.filesusr.com/ugd/8b97dd_d7c658848f7046ce934ccc3008624027.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/68a8992c-7d7c-465c-967b-9983316bff9f/73087844108.pdfIn PDF document text
    • http://vanabigura.rf.gd/mukimomizaxika.pdfIn PDF document text
    • https://69f7c7ec-f776-4f8b-90c4-e8126cd531e3.filesusr.com/ugd/772020_09cccaf3868a4dcf9f256c7290547557.pdf?index=trueIn PDF document text
    • https://7ffe38df-ef78-47a1-8632-a9c579db478a.filesusr.com/ugd/8ff694_7b6cc87c4c7d449e9f2139f2c2ace033.pdf?index=trueIn PDF document text
    • http://ledonapagemes.epizy.com/chill_music_mix.pdfIn PDF document text
    • http://luvetux.myartsonline.com/90662102247.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8d273fe-55ae-46df-a493-6ee6fd845149/26665285975.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c952d0a6-bb02-486f-a9ca-ff82c40512b8/how_to_remove_baby_einstein_jumper_seat.pdfIn PDF document text
    • https://s3.amazonaws.com/xubifupi/muxarosumofe.pdfIn PDF document text
    • https://c07b3cb0-7d4a-4e65-9c62-eb3bd0ce3b6b.filesusr.com/ugd/7560d5_97b22ad05baa4cee8a1a5707d277a7b2.pdf?index=trueIn PDF document text
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_ad60a59005b141b4b3d014fb55634625.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mosezavor/suwun.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/dupumajunuveraluzadez.pdfIn PDF document text
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_979de355f04d4be4852505b33cdb83ff.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_off0000e776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE776 5408 bytes
SHA-256: a4508adc86aec5240effbd97b7f6223d328bf9dd2974583a446cd6a39305aa85
font_01_sfnt_off0000fa04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA04 10944 bytes
SHA-256: d0e2a197d05a5869ea4a29e7cedaa1d438f71e08182c4aa3388fb631d3263f53