Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f178503f9cc22a2…

MALICIOUS

PDF

92.0 KB Created: 2021-05-30 23:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 7079a9952b3183573019867f1100be01 SHA-1: 5b08e31dea79a4822de047fda814c2494e31ac1f SHA-256: 8f178503f9cc22a2d38bd78cdfc7d49826b2f84a5bd1a4cafe105f3506f9c236
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 0.9988

Heuristics 6

  • 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 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://mezovuduw.ru/123?utm_term=python+spyder+auto+format+code PDF link annotation
    • https://boxagotogod.weebly.com/uploads/1/3/4/4/134491964/fupakades.pdfIn PDF document text
    • https://dejalujufoleto.weebly.com/uploads/1/3/1/3/131378776/1596c6a938.pdfIn PDF document text
    • https://rowiranuzexu.weebly.com/uploads/1/3/4/4/134436227/nogide.pdfIn PDF document text
    • https://jadufebifov.weebly.com/uploads/1/3/4/6/134627690/520678.pdfIn PDF document text
    • https://lilawowawumoxo.weebly.com/uploads/1/3/1/4/131453384/netenutukidavigode.pdfIn PDF document text
    • https://bejobajota.weebly.com/uploads/1/3/4/7/134727936/252c8bd56.pdfIn PDF document text
    • https://kirirakux.weebly.com/uploads/1/3/4/8/134894882/fumawoxulogumavafu.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/6246ba70-e1ac-402e-9691-23b9d07522b2/how_to_choose_automatic_watch_winder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92dbc5de-bc59-4d03-af77-d29935b8c30f/oops_concepts_in_java_with_examples_for_beginners_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8b5ee21-6b45-48fa-8b70-4bd491525355/java_swing_boxlayout_button_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cace332-3dfb-418e-9030-5ee2d6db4816/9255872878.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f00ddfae-385b-4fe6-a41d-0d86c735413d/how_to_mix_rb_vocals_logic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db9c8c8e-b08f-48e9-8ab7-1fe48fa8072a/human_resource_development_multiple_choice_questions_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0f5e5ab-f1d0-4a35-9ecc-5667122633bb/how_to_start_the_whirlpool_washing_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/458b246b-6d6f-4954-876c-c21134bbd9ba/37081096269.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5465eb84-fd9f-4e29-96ec-c0550537f898/citizen_skyhawk_at_replacement_band.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a743fc30-26a9-42e5-bc66-23797de0af95/apple_watch_hermes_face_no_jailbreak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de26cec8-1f64-4a3f-867b-0761c1c33373/puxirikasokazabogoputedix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f56ef4e-d6b6-4ea9-81f0-a5b51015547b/87473879561.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03362247-929e-4b08-825d-fb7c14a15c36/50985763024.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fb4ed62-a91b-478a-9228-a3b52894d9cb/what_is_f_value_in_anova_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2424e800-cbf8-4e7f-b19e-9d32fee63b07/rakedusuxajape.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0179232-fa3d-421a-9699-45e0ebe1323c/tatoxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86c3b536-196b-4ac9-8490-86764626de06/download_removewat_windows_7_build_7601.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000110f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F1 5468 bytes
SHA-256: 65fc0f23aec06e00e75f8b1a7af954e3763532f2f18e03475a9fc40a839a17e0
font_01_sfnt_off00012364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12364 11808 bytes
SHA-256: bc4df065857a1b929b601c738275dbb453b152b50edaa717c20fe3154f924d3f
font_02_sfnt_off00014bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BCF 16524 bytes
SHA-256: 0a3405e4436f0124f56624aa54bfd4db0e457c16c31742b0243d19e7f4b08adf