Malicious PDF — malware analysis report

Static analysis result for SHA-256 00731f124bec2ace…

MALICIOUS

PDF

78.4 KB Created: 2021-04-16 13:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e937c82989e6ad4c99274d3dfeec3d64 SHA-1: 0a19491e64f45e57bb1c6bdb208cfb9ea9f88701 SHA-256: 00731f124bec2acef9b14fc79d7f86d1654e38bd57d5bb0845f823571e149a00
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs, with one pointing to 'vilenefex.ru', suggesting it functions as a link farm. The document body is heavily obfuscated and appears to be a lure, likely for phishing or malware distribution, and the presence of embedded URLs further supports this. No scripts were extracted from this sample.

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://vilenefex.ru/strik?utm_term=how+are+atoms+held+together+in+a+hydrogen+bromide+molecule PDF link annotation
    • https://jerefukixuludew.weebly.com/uploads/1/3/4/6/134686450/solazufifuxi.pdfIn PDF document text
    • http://giwosoto.sportsontheweb.net/67824451191.pdfIn PDF document text
    • https://fiwirozubaxezu.weebly.com/uploads/1/3/4/6/134659856/jewozoditowidetijifu.pdfIn PDF document text
    • https://lebabipiw.weebly.com/uploads/1/3/0/9/130968925/4087319.pdfIn PDF document text
    • http://riwozizedilar.mygamesonline.org/ardas_in_punjabi.pdfIn PDF document text
    • http://vijofudevadotar.mywebcommunity.org/meaning_of_social_capital.pdfIn PDF document text
    • https://jizonuwuko.weebly.com/uploads/1/3/0/8/130814311/mofibetazejowiliboj.pdfIn PDF document text
    • http://boldly-grow.com/ti-84_plus_ce_charger_near_meakxfj.pdfIn PDF document text
    • https://vuwugaletop.weebly.com/uploads/1/3/4/5/134588193/rivonuzef-busota-jekaragasig.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/how_to_become_a_lab_technician_in_australia9atkp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/99189c86-7acd-4770-8c06-751c69d6673d/dixie_chopper_silver_eagle_2550.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e42f437c-e887-4a35-98fd-e93a27a62e92/67358109168.pdfIn PDF document text
    • http://dilutibu.onlinewebshop.net/pejigugemojugu.pdfIn PDF document text
    • http://xabudavadeguvo.myartsonline.com/vamomipawumasiz.pdfIn PDF document text
    • http://zipulosi.atwebpages.com/33416003306.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4dd0df6-254a-47c4-b160-ab405098a54e/becoming_a_person_of_influence_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42b0a2b8-4c08-4256-b6fd-cf651fa33613/fender_twin_reverb_schematic_master_volume.pdfIn PDF document text
    • http://xasagode.myartsonline.com/directive_2020_65_eu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d9ac567-ec22-4bcf-92ce-43adb24753ab/rugugejamuvagowi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE615 5528 bytes
SHA-256: 38ed84f9a6e8c549616f1714c1b3d9ad7e6a29945a520fbd8179be9274c35476
font_01_sfnt_off0000f8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CA 10820 bytes
SHA-256: 5a99e87a1923d6a18a35f74f805cebc87d90319d614e0c3a2e28b60d9da56ff8
font_02_sfnt_off00011dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD8 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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