Malicious PDF — malware analysis report

Static analysis result for SHA-256 29c7baae86748486…

MALICIOUS

PDF

73.2 KB Created: 2021-06-03 15:06:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ad9af95434f9120952e5c524dbaa7a7d SHA-1: db80d720bd27c63a0bb18379120b51960162666d SHA-256: 29c7baae867484864da362d398193021ed62921f834a7ebbf880d52d7e4f627c
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://coretry.ru/pbw?utm_term=diamond+math+problems+worksheet+works+answer+key PDF link annotation
    • https://kosonijuzar.weebly.com/uploads/1/3/5/9/135974682/nusivasipe.pdfIn PDF document text
    • https://mabaxezo.weebly.com/uploads/1/3/4/7/134766945/baduz-zadenavut-wipim-dabofexana.pdfIn PDF document text
    • https://sodomolu.weebly.com/uploads/1/3/5/3/135398587/dabumevot.pdfIn PDF document text
    • https://sobeponul.weebly.com/uploads/1/3/4/7/134756425/7481193.pdfIn PDF document text
    • https://xonarupitowij.weebly.com/uploads/1/3/4/6/134617661/69fb0c2.pdfIn PDF document text
    • https://vefotufujipewux.weebly.com/uploads/1/3/4/4/134401009/nazodozake.pdfIn PDF document text
    • https://xazexotuxumuku.weebly.com/uploads/1/3/4/7/134719447/zotapulijine.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wikitaxif.pbworks.com/f/uefa_europa_league_2020_21_calendario.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fc58485-99c4-4acf-bf60-a8d2b45404e0/what_to_do_if_your_dishwasher_wont_drain.pdfIn PDF document text
    • http://zepadatoju.pbworks.com/w/file/fetch/144425181/how_to_fix_keyboard_keys_typing_wrong_characters_-_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbedc0d8-57c9-4372-a354-31494be2a31a/how_to_reset_white_rodgers_thermostat_1f81-261.pdfIn PDF document text
    • http://lexibitite.pbworks.com/f/80024503532.pdfIn PDF document text
    • http://kakewizajupe.pbworks.com/w/file/fetch/144533265/37926549119.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/391bc866-d0c0-43bb-9c72-34cc8160cc72/foxotababuturugiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/643590b3-6d47-4320-8df3-a566b83a7a19/watch_me_before_you_sub_indo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34b35e51-a0de-4f6d-82e7-e542e1690a20/zimamuvuxijuxofizebiwavo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79cf8f12-bb20-487e-9687-a13de413c0dc/47388738886.pdfIn PDF document text
    • http://siwuromo.pbworks.com/w/file/fetch/144425412/pavagada_solar_park.pdfIn PDF document text
    • http://dejulagimu.pbworks.com/w/file/fetch/144545232/what_is_the_meaning_of_the_poem_i_too_sing_america.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea2c4e94-72db-460b-a13c-a3ced7f7ee29/pimixesojifojusidoge.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE034 5596 bytes
SHA-256: d7c176296e9a3206bd6e67fff541ac8785ede0d9b51c93e9948501913d5ca626
font_01_sfnt_off0000f31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31F 10600 bytes
SHA-256: 58b8e3b623e421d773982136d2d5ce239472ab860f03606df339f9055cf8d464