Malicious PDF — malware analysis report

Static analysis result for SHA-256 72c3048d5dd9d6b7…

MALICIOUS

PDF

77.9 KB Created: 2021-03-21 12:22:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68726f5d8405f848b68d7a687170fe97 SHA-1: e2d7515208fdd485c8ec0b10c6875d568c01e4cf SHA-256: 72c3048d5dd9d6b715daad2df71739c9189324d29dde8b23333265925e38002b
186 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm or phishing lure, indicated by the presence of numerous external links, many hosted on disposable domains. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification returned a high probability of maliciousness. The document's structure and embedded URLs suggest an attempt to redirect users to malicious content, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://soxebez.ru/award?keyword=redes+alimentarias+pdf
    • https://zoxujaratufopa.weebly.com/uploads/1/3/5/3/135399722/ririnukikov.pdf
    • http://rijigikesezaga.mypressonline.com/what_gear_should_i_put_my_bike_in.pdf
    • https://cdn.sqhk.co/dasekizob/1iFFtNC/catfishing_rigs_for_channel_catfish.pdf
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/e07380d65bd53.pdf
    • https://cdn.sqhk.co/xubupigegi/82hghbC/dragon_snake_game_cool_math.pdf
    • https://cdn.sqhk.co/girolivudafo/icjhhhj/vufelejajativatuk.pdf
    • http://bivitajuteje.mypressonline.com/51950918100.pdf
    • http://gegetamuwu.iblogger.org/biwofegukorebawokitizu.pdf
    • https://vekoduxiboba.weebly.com/uploads/1/3/1/3/131398498/7384619.pdf
    • https://pomisefinare.weebly.com/uploads/1/3/4/9/134902228/piditez-gitutonoro-wawaboj-kufowuxam.pdf
    • https://cdn.sqhk.co/xonoguduzob/jhfidgg/jekivokelop.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5405d108-7f1e-482b-a10c-e06f62b7505d.filesusr.com/ugd/d941b1_4642ba093dc0445e977667b566e80f43.pdf?index=true
    • https://203e7bc3-08d7-4ecc-a8df-f797e0d4a079.filesusr.com/ugd/d4579c_aa8a0d2bb9554ffbbf3d8030312fb337.pdf?index=true
    • https://3df06c22-1e8a-4082-8cc2-a0fdc0609706.filesusr.com/ugd/d86e81_267bc6cbf27f4c87b6193f3fa5077cd6.pdf?index=true
    • https://8dfdba76-182f-4dc4-9dda-37a8c8d09dc9.filesusr.com/ugd/4ae4db_597d9f0c6c9e465184ef485fb2353ab8.pdf?index=true
    • https://f6ce3cfb-f922-470c-9e0e-eaf724001b0e.filesusr.com/ugd/defcb2_1b6d5801f61f43f5a38cc5003f35a1bf.pdf?index=true
    • http://lonesopuw.onlinewebshop.net/figifitedijumederuge.pdf
    • http://fakesux.epizy.com/mizizubemodex.pdf
    • http://botesuni.epizy.com/silodosiferimaxorab.pdf
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_4008cdeeaf60409abb73232989a16634.pdf?index=true
    • https://1ce8651a-bfbb-4b9a-b1bf-24b3b574775a.filesusr.com/ugd/ac72e0_7efbda4c07034af9a07c3357f27588b3.pdf?index=true
    • http://makakanow.onlinewebshop.net/whats_the_coldest_city_in_the_united_states_today.pdf
    • http://dezoruxeg.epizy.com/wozulizonideguramujekaf.pdf
    • https://141ebdc9-a3c9-4c6d-b8f9-366dbf139dec.filesusr.com/ugd/46bfb0_8e41951bd4224890a18b8bc4999e7059.pdf?index=true
    • http://fovuwikotunepam.rf.gd/80190617532.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_off0000f083.bin
4f146ce263d0c1caa0071cc124cc34304aa97daafb94b64e5a46250607f18323		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF083 5196 bytes
font_01_sfnt_off00010217.bin
fe3bc32cf127b3bd3828b23fb79ffae3c1f007d846f45e912cce76dd9a8e9baf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10217 11980 bytes

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