Malicious PDF — malware analysis report

Static analysis result for SHA-256 33ba93b79ca5e8b5…

MALICIOUS

PDF

87.2 KB Created: 2021-03-15 15:48:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e90a816b1c5fcc55a4d400f624ad0a6d SHA-1: 99c35b8e7a49e582fdbcf1ce48dec14e0ef73383 SHA-256: 33ba93b79ca5e8b5970afa62ca4974c0a44d9d95a99189133f14b780cabb480a
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 0.9993

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://jumiwimov.ru/award?keyword=basics+of+computer+hardware+and+networking+pdf PDF link annotation
    • https://cdn.sqhk.co/birofinud/LrkgiQP/marketplace_mall_covid_testing_site_hours.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/Kigfhg2/dungeon_of_doom_game.pdfIn PDF document text
    • http://damewumesigalut.medianewsonline.com/fotakezonenubuj.pdfIn PDF document text
    • http://sixawuragime.iblogger.org/star_wars_the_old_republic_wiki_bounty_hunter.pdfIn PDF document text
    • http://nixekagog.22web.org/what_are_the_types_and_classifications_of_antibiotics_and_their_actions_ati.pdfIn PDF document text
    • https://cdn.sqhk.co/misusulebix/98ggljc/supermodel_star_fashion_game_mod_apk.pdfIn PDF document text
    • http://tipofeliluget.medianewsonline.com/what_n-type_semiconductor.pdfIn PDF document text
    • https://cdn.sqhk.co/tawibonikigo/jiibifu/gunogevudexisigisira.pdfIn PDF document text
    • https://cdn.sqhk.co/vetukalujir/hjejcr9/tivorimanurebededemusafev.pdfIn PDF document text
    • https://cdn.sqhk.co/rufosopufu/YBjhgdh/kong_company_llc_golden_co.pdfIn PDF document text
    • https://cdn.sqhk.co/mevexobuzur/zifgfOM/screen_guide_parental_control.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6991965-f486-471f-bfbd-4bcc086d2717/asp.net_core_3.1_web_api_tutorial_for_beginners.pdfIn PDF document text
    • http://pozijawikubinun.myartsonline.com/canzoniere_testi_e_accordi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0749f256-035c-4964-bb78-765e663599f6/dometic_penguin_air_conditioner_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/317aed60-2921-439e-b533-6c062c5d7320/57804106702.pdfIn PDF document text
    • http://vilumepidiwego.myartsonline.com/d_d_descent_into_avernus_free.pdfIn PDF document text
    • http://soranodabiwegi.myartsonline.com/sawisagaleri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1138f54-d8d7-411f-8ecf-db379c7c388c/comcast_latino_package_channel_lineup.pdfIn PDF document text
    • https://9cf5cc10-3c2e-4e30-ae6b-73ed7beed88a.filesusr.com/ugd/5c2b46_5d2bd7b740844d39bce8cb613358e7ad.pdf?index=trueIn PDF document text
    • https://f635e5d9-31b1-4f19-b758-7a623be10181.filesusr.com/ugd/6cf0f5_3376d9dde5604cd58313ee47a4a2cda6.pdf?index=trueIn PDF document text
    • https://c9107794-7b31-4e5c-84de-5db174abdfaa.filesusr.com/ugd/aabf5f_36fb3004cf0147079785284715521a0b.pdf?index=trueIn PDF document text
    • https://d9226533-59f4-4737-ae77-cfa9cdee5378.filesusr.com/ugd/d7c203_0d8bb718012643928c2fd074e6a0356d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfc344c2-013e-413d-b8e9-f0aaba556067/73320930131.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_off00011744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11744 5744 bytes
SHA-256: aa9908f29aae007503ccffc1eb44b4aec00e562d0cf99de208529bff2096f6be
font_01_sfnt_off00012ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB8 10744 bytes
SHA-256: b443d07bd17734c769c56a46ea175e62cbd983c11f1f55e7f92bd6761a02891f