Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e0741ed3a78f5c…

MALICIOUS

PDF

78.2 KB Created: 2021-03-14 06:08:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4eb4b27ebb9d6f2312a4685c6a6c07ce SHA-1: 714ca1084a08fc69f9f3fd58f2b23ec4c9437934 SHA-256: f5e0741ed3a78f5cec1afc4dca63d8aad290cc0c218c4d1db31abd4bd485d044
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it is part of a link farm or phishing campaign. The primary URL, https://kuzutuzo.ru/wix?keyword=maine+coon+kittens+for+adoption, is used as a lure, disguised as information about kitten adoption.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/wix?keyword=maine+coon+kittens+for+adoption
    • http://kapovulup.mywebcommunity.org/2503276679.pdf
    • http://xuzerujagojagip.scienceontheweb.net/how_the_grinch_stole_christmas_auf_deutsch.pdf
    • http://gipogup.sportsontheweb.net/pujiruzizozit.pdf
    • http://tanivikovome.sportsontheweb.net/31585221716.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_84a47117a1814abcae333eecea2141db.pdf?index=true
    • https://9e6c4f0b-3406-4274-bf8a-5be7f948d240.filesusr.com/ugd/45c6ff_3938098834b04efba26d7525bf17d903.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f0e4e50f-df04-4edb-851b-56f9b9d0c381/47382410704.pdf
    • https://s3.amazonaws.com/lewuli/ralexibedazedidaniti.pdf
    • https://uploads.strikinglycdn.com/files/060d9e54-230c-4dc3-81fc-f61dae50825f/ion_block_rocker_max_ipa76c2.pdf
    • https://s3.amazonaws.com/sajatofubote/casio_g_shock_wr20bar_change_time.pdf
    • https://s3.amazonaws.com/gavexilatuvitaz/frp_bypass_solutions_free.pdf
    • https://uploads.strikinglycdn.com/files/532de545-28d9-4e47-9933-0a1349d8d1df/72989114619.pdf
    • https://s3.amazonaws.com/gimisorixosu/80610726609.pdf
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_5a9b38326d1545d59b7ad2b3a183c6d4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c4b53c1c-0065-4f95-b83e-205ac235406c/10814397997.pdf
    • https://926da24b-d3df-4aea-ac1b-ebdf7359a9e7.filesusr.com/ugd/fef925_7e481f5dfc2a4071b72473e4775ae7fa.pdf?index=true
    • https://uploads.strikinglycdn.com/files/43e789be-ae09-4cd1-9360-f94ee37d49ea/what_does_raw_mean_in_digital_photography.pdf
    • https://uploads.strikinglycdn.com/files/239babe7-eed9-4857-8502-962bcf99cc95/what_are_the_principles_of_physics.pdf
    • https://e18e6c05-101e-4f41-9c4d-f518aea09dbb.filesusr.com/ugd/7972b3_a5d8a3aee7a841e3b60bcb260a7a751e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1831c20f-09ac-4676-a14d-35bae5c576d9/lixuzi.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_off0000f3dd.bin
2dc27568bb3518d5f671eb55a11cf530ee5e9d922d7c2bb058ba8fdf5db44903		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DD 5188 bytes
font_01_sfnt_off000105a5.bin
a8c98fc36432700c8ada3a715166ef99f15984983caddd597860965871b78000		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105A5 11384 bytes

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