Malicious PDF — malware analysis report

Static analysis result for SHA-256 a40340f49d4f8a34…

MALICIOUS

PDF

82.8 KB Created: 2021-05-31 15:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 986b4107b92929a5b33588f75f80c63b SHA-1: cb9b902c19ac50979f94b51299a68d5fb8f104ba SHA-256: a40340f49d4f8a347c28ec046376e5945955a625bb51a16bd9c7444048c3515e
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 0.9990

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://dugedepap.ru/123?utm_term=motu+patlu+cartoon+video++tinyjuke PDF link annotation
    • https://dutegonuguval.weebly.com/uploads/1/3/4/3/134310875/2118660.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373987/normal_5ffe91c64b28d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391896/normal_5fdab9ff57fa1.pdfIn PDF document text
    • https://tetavezodumop.weebly.com/uploads/1/3/4/6/134645623/pixurusutuzoro.pdfIn PDF document text
    • https://zewemoledomuro.weebly.com/uploads/1/3/4/7/134746436/sevifivimiwud-waxigadekada.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365624/normal_5ff3c97ed0d03.pdfIn PDF document text
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/53e3f6c.pdfIn PDF document text
    • https://punafatig.weebly.com/uploads/1/3/1/4/131408139/kunijivifomuxi.pdfIn PDF document text
    • https://bisubobotikimix.weebly.com/uploads/1/3/1/4/131438323/e72100f62958b.pdfIn PDF document text
    • https://tapajiwegunet.weebly.com/uploads/1/3/1/3/131380495/8695542.pdfIn PDF document text
    • https://disefiduwixa.weebly.com/uploads/1/3/5/9/135981448/fovuga_zupamoji_pujuwax_jiripobar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428061/normal_605a18e2a1b95.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/71bb3246-f81b-4fbe-ab5c-ffad68cd37fc/weber_smokey_mountain_57cm_accessories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f89ea04a-29c1-4f7b-9639-b7ecab47ddfb/metititakifapepapop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ac22ad1-6959-4d0c-85c9-7e1d60d97443/92161375113.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05d3cab6-8996-4a14-b002-17cef6d4bf3c/41865155476.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a05eefb-428a-42ec-b9a6-95497cb99c02/is_procreate_for_ipad_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a04ddc65-c2ac-46d6-a415-13824d8e63ce/xasojadiso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60ff2f47-db28-4e53-9cdb-b4e3457dd192/dufozotezuvar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34b1b990-c7cc-4ea6-90e2-6c4c9f76ba5a/64020384001.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74cff200-78e0-464c-b08a-f18f87cd50ce/dejepame.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34fa3f1c-c659-420f-8a66-f91c04bfe30a/cozi_tv_schedule_today.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8db10a9-0a92-44f4-806d-9c57f7e1b9fb/sopranos_cookbook_sunday_gravy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee9e0b24-d87b-4144-81c7-929828e23154/jozarokugudizoginibabu.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_off0000edbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBE 5196 bytes
SHA-256: fc39a690e12ba3603b07910a38da64ad90e5e8351423b2686436db569028cbf3
font_01_sfnt_off0000ff98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF98 10456 bytes
SHA-256: 7f63f944f1070c69838960016e6bffd0bd3715e2198ea9110a62c91f0d9d2f22
font_02_sfnt_off000123ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AE 17312 bytes
SHA-256: 0664053e40f32cf9fb2304728e706792856cef25cc3f883e00c2799e0753caa3