Malicious PDF — malware analysis report

Static analysis result for SHA-256 af10d77ca6f7801e…

MALICIOUS

PDF

79.6 KB Created: 2021-04-07 19:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe2f3bceea6c3cb7656e154c1f2d3ac2 SHA-1: 0c407df8b05c31201beeb9fa3c979742ef0489c6 SHA-256: af10d77ca6f7801e64be89eb01df435f5ac291d179399554e5a1f676ac91d615
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection as a phishing trojan. It contains numerous external URIs, with one pointing to a suspicious domain 'druttle.ru'. The PDF's structure and embedded links suggest it functions as a link farm designed to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/123?utm_term=spanish+comparative+and+superlative+worksheets+pdf
    • https://mumanewuneju.weebly.com/uploads/1/3/2/7/132712109/kufepoleg_gadukaronamag_lilibodopefewo_nutobusogote.pdf
    • https://jarurozo.weebly.com/uploads/1/3/5/3/135320013/5291209.pdf
    • https://tetoxoji.weebly.com/uploads/1/3/0/9/130969306/selumezimag.pdf
    • http://air-calm2.club/kofifukoh6nnx.pdf
    • http://roman-holidays.shop/85494654945fkqkn.pdf
    • http://varistop.site/brother_mfc-j410_not_printingwm9lx.pdf
    • https://cdn-cms.f-static.net/uploads/4380695/normal_606c27fe17cb5.pdf
    • https://cdn-cms.f-static.net/uploads/4488332/normal_602cd74996839.pdf
    • http://giocodigital.fun/vesufefimasizo7zvgo.pdf
    • https://fenatinuzari.weebly.com/uploads/1/3/5/3/135314561/rapumolilajemuf.pdf
    • http://pixell.store/weber_electric_bbq_home_depot3ss0v.pdf
    • http://online-bestshop.xyz/fuvelevujopozigegetaf73.pdf
    • http://mufutekuson.getenjoyment.net/68899215022.pdf
    • http://lozipazom.sportsontheweb.net/texas_zip_code_listings_2018.pdf
    • https://kivogumit.weebly.com/uploads/1/3/1/0/131070776/7941584.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9752c82d-a8d3-41b3-9673-3db90526ba9c/83098118382.pdf
    • https://uploads.strikinglycdn.com/files/ece1e444-56fc-4c5f-99b0-b3f3a003627a/are_firex_and_kidde_compatible.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f678.bin
d280653d973d955224ecfe750a92189c17ca873a7ee1b72ed3bf2005d6548027		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF678 5712 bytes
font_01_sfnt_off000109d9.bin
2ed80ab2eb102bda80407ce724786f2d13c540fc8c79e25b98cb6a3026b9f11e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109D9 11964 bytes

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