Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e12fbbf646b33eb…

MALICIOUS

PDF

79.7 KB Created: 2021-04-15 14:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e02010e2185d900d607735aded8a828 SHA-1: 181164e2ecae4a0feab5874d4aa1c469434e933d SHA-256: 8e12fbbf646b33ebd41d8dbeb5732a5b0614a5f31bcb44cb408f09011d6f2c17
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially malicious sites. The embedded URL `https://midufefew.ru/strik?utm_term=what+is+hardware+diagnostic+tools` is particularly suspicious and likely serves as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://midufefew.ru/strik?utm_term=what+is+hardware+diagnostic+tools
    • https://static.s123-cdn-static.com/uploads/4471723/normal_60072bc7391ac.pdf
    • http://about-central.com/75313527200lulb7.pdf
    • http://quickpapp.online/63371938470cxgac.pdf
    • http://lixidavek.22web.org/pasifeveviki.pdf
    • https://cdn-cms.f-static.net/uploads/4411229/normal_60146cc7b4906.pdf
    • https://cdn-cms.f-static.net/uploads/4455881/normal_5fd9612c1b7b6.pdf
    • http://chestlune.online/charlie_and_the_chocolate_factory_streaming_sub_indoieyvb.pdf
    • https://cdn-cms.f-static.net/uploads/4412773/normal_5fe94abb6b3ba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_eeec96d9faa648729a02a2e50725fbfe.pdf?index=true
    • https://793776f3-68b4-44d3-947a-596ce2c6f652.filesusr.com/ugd/4e977a_c20121d766ad431b8e82b6815da75dac.pdf?index=true
    • http://sotatelovutegep.epizy.com/59879246836.pdf
    • https://b9ecad59-ee1c-469f-8402-ddbad3bf215f.filesusr.com/ugd/84dab8_1fff82674e7d4b328d6e314fdec8a3b6.pdf?index=true
    • https://7ae774ad-b64d-4473-a0b1-aa0db1e39e83.filesusr.com/ugd/3e7897_2ae0b3013a414e63a29baa06fd505ebf.pdf?index=true
    • https://ede8a7a3-2377-4e09-926a-401222b31c25.filesusr.com/ugd/81c89d_96cd8001ba0a43c49820cb62896bda4d.pdf?index=true
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_c4679ee0068d4c53b4a844b888fcd7b6.pdf?index=true
    • https://s3.amazonaws.com/fadobirak/25868259497.pdf
    • https://1e1f235d-56dd-4976-b20d-d38e3fe7b172.filesusr.com/ugd/210b45_4c427f288dfc4223aa63b5d9facd0e5a.pdf?index=true
    • http://wadusobu.rf.gd/wuzobimusutexipigadivo.pdf
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_863f71942e194d67ad063a9842c5eb28.pdf?index=true
    • http://jikirukuda.rf.gd/catalogo_de_tintas_suvinil.pdf
    • https://s3.amazonaws.com/mukut/86043253817.pdf
    • https://s3.amazonaws.com/kawotexulozax/linux_programming_book.pdf
    • https://s3.amazonaws.com/pidufozu/what_beef_to_use_for_tartare.pdf
    • https://6b54b0b2-91db-43cc-88c8-bbc4f7e20b37.filesusr.com/ugd/a773aa_4976fb9f4ae34b94a8b9a52e569c9e11.pdf?index=true
    • 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_off0000f8e5.bin
6d004c15d39628df6fdf3902f6a4c88f343e42dce0dfb24e4f07c7f04b11900d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E5 5304 bytes
font_01_sfnt_off00010b02.bin
f7a4463a73e434969747af3604384c9b3a65ce3fad3afb4bfe213434104b51f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B02 11216 bytes

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