Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cadfda3ce48d67c…

MALICIOUS

PDF

78.1 KB Created: 2021-06-08 23:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 845235468f5f3e6cc96681599ad1443a SHA-1: b1025dc1a4d1e79262d827e4e504c863a5f296c6 SHA-256: 9cadfda3ce48d67c2bf9b599b38faf0b9d74a6eddf4b23176c533049b85a0dbe
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 0.9992

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://soxebez.ru/123?utm_term=higher+lower+answers+2019 PDF link annotation
    • https://rugepokowefi.weebly.com/uploads/1/3/5/2/135294276/5547341.pdfIn PDF document text
    • https://fepexugoroba.weebly.com/uploads/1/3/4/4/134469665/482916.pdfIn PDF document text
    • https://karuxuli.weebly.com/uploads/1/3/4/3/134377251/957555.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gazumadu.pbworks.com/f/chhota_bheem_and_the_curse_of_damyaan_full_movie_in_hindi_hd.pdfIn PDF document text
    • http://poxanoralanu.pbworks.com/w/file/fetch/144569541/diary_of_a_wimpy_kid_2_full_movie_watch_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b890a46c-9f8d-4121-926b-44bca8ab33d3/driver_booster_7.4_crack_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56859777-2040-4c04-9efd-b014740ddaf0/breville_juice_fountain_cold_plus_manual.pdfIn PDF document text
    • http://pilujibos.pbworks.com/w/file/fetch/144565848/9625367230.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fef96646-e20d-4dd9-80c2-9fc4b96d416d/41782861541.pdfIn PDF document text
    • http://tukufidanega.pbworks.com/w/file/fetch/144422019/simcity_buildit_cheat_codes_ios.pdfIn PDF document text
    • http://mevuteled.pbworks.com/f/47660087214.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00019d1e-a156-4ef5-b545-495aa3edbe19/how_do_i_find_my_autocad_serial_number.pdfIn PDF document text
    • http://negaboxa.pbworks.com/w/file/fetch/144447477/gagizodajugivexezexulix.pdfIn PDF document text
    • http://polujare.pbworks.com/w/file/fetch/144616467/432742570.pdfIn PDF document text
    • http://xuwedateredu.pbworks.com/f/gubezemunopowitabexuwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c913475e-1870-42f8-bf5f-0cbc71a1d6a3/80091539460.pdfIn PDF document text
    • http://tezalef.pbworks.com/f/i_am_offering_this_poem_comprehension_check_answers.pdfIn PDF document text
    • http://gudotoxej.pbworks.com/f/how_to_create_a_branch_in_git_and_push_to_remote.pdfIn PDF document text
    • http://veposasidot.pbworks.com/w/file/fetch/144786882/how_to_use_a_letscom_fitness_tracker.pdfIn PDF document text
    • http://gamaxidad.pbworks.com/w/file/fetch/144539031/favepojopij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a183ccc-4244-4b03-b4a3-fb6fd11d155e/lee_child_books_short_stories.pdfIn PDF document text
    • http://godekazonigi.pbworks.com/w/file/fetch/144433803/piwugizugavebokevozebuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/788d1b7b-910d-48a2-9a5a-33391d346f51/microsoft_office_professional_plus_2013_product_key_generator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/197b8b76-0092-4d2e-985f-4e7a6cf023e8/black_and_decker_food_processor.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_off0000f235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF235 5480 bytes
SHA-256: f22af82a0ce1d707f59575872ece7da42e287bc683191b42c71dc1721fd8a99c
font_01_sfnt_off000104e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E2 10700 bytes
SHA-256: f595c495d3d475d0d201e6085a753ecddb0ea40d148f37b2b011a917786f1152