Malicious PDF — malware analysis report

Static analysis result for SHA-256 869633f35e8d0399…

MALICIOUS

PDF

74.8 KB Created: 2021-03-24 16:10:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0dcb96f6ad291c9e7f9a412d27e8917e SHA-1: 972c838e31d1f027372a7e640570a5e0855349e0 SHA-256: 869633f35e8d0399fa5e7d7d27720a08e439d7f88d32a9a214c1d1c7145396f7
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'dafemum.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF's purpose is to host a collection of links, likely for malicious redirection. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://dafemum.ru/strik?utm_term=white+tiger+look+meaning
    • https://static.s123-cdn-static.com/uploads/4447280/normal_5ffb1c1ea93f5.pdf
    • https://static.s123-cdn-static.com/uploads/4402933/normal_5fe01a7778459.pdf
    • https://cdn-cms.f-static.net/uploads/4479673/normal_6022d2d44ea3d.pdf
    • http://zotuxizuso.iblogger.org/blender_beginner_tutorial_level_2.pdf
    • https://cdn-cms.f-static.net/uploads/4421039/normal_60118ac34737a.pdf
    • https://static.s123-cdn-static.com/uploads/4496607/normal_5fedce348da42.pdf
    • https://static.s123-cdn-static.com/uploads/4390680/normal_5fc87ebb51389.pdf
    • https://static.s123-cdn-static.com/uploads/4454967/normal_5ff041fbbf2f5.pdf
    • https://static.s123-cdn-static.com/uploads/4500887/normal_5fcec0c32d77a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wofaxil/guideline_for_continuously_operating_reference_stations.pdf
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_32e6dbf747254c63809a750c3d15c038.pdf?index=true
    • https://s3.amazonaws.com/xidulumexi/bohunt_sixth_form_twitter.pdf
    • http://vapodizasogore.epizy.com/90436793726.pdf
    • https://s3.amazonaws.com/tobito/21008070692.pdf
    • https://s3.amazonaws.com/womirofop/tulofibumuvonale.pdf
    • http://vagowezu.epizy.com/64995408359.pdf
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_53131322d3474a36860d7fc096189fab.pdf?index=true
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_8d9a8ae2d8bf40259153a9e70d5b558e.pdf?index=true
    • https://s3.amazonaws.com/davolazupivowi/aadat_hai_mp4_song.pdf
    • https://30372bae-fb3d-4285-bee0-d91e70c22047.filesusr.com/ugd/835091_b5201dc182a04fc98adefb9651e319c2.pdf?index=true
    • http://kidagemomosate.epizy.com/botanicula_for_android_free.pdf
    • https://cf587a47-7c2f-4f55-8bbb-21a4c73503f7.filesusr.com/ugd/8ea597_dbeb859ef9b54fa3912ecb2581569c09.pdf?index=true
    • http://xutakubu.epizy.com/37608549527.pdf
    • https://s3.amazonaws.com/pasutiz/53894120916.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_off0000e788.bin
f5c4907c670e54a28049e7ade204a1dc046c18f249c742f8adf513b822c21ccd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE788 4996 bytes
font_01_sfnt_off0000f86a.bin
c933166129778292d53fc4a1166632cf69e0080ef566ab2cf02843d04514c66a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF86A 10924 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.