Malicious PDF — malware analysis report

Static analysis result for SHA-256 4360a6b2eb96c35b…

MALICIOUS

PDF

73.4 KB Created: 2021-04-02 09:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3c717f7e248b0a76b781f4b046b76e64 SHA-1: 529b6b125af8e7b5a743dd4fff035e55fd049afb SHA-256: 4360a6b2eb96c35b3052f8c01732f519d26857341c55a3825e8ad06beaad50b2
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 0.9995

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://xajibur.ru/award?keyword=banking+chronicle+may+2020+pdf PDF link annotation
    • http://wivikaxebox.medianewsonline.com/ccnp_300_115_syllabus.pdfIn PDF document text
    • http://jonebukusopovet.mygamesonline.org/campbell_biology_10th_edition_ting_vit.pdfIn PDF document text
    • https://cdn.sqhk.co/dobajinorite/jLoyiat/72982440343.pdfIn PDF document text
    • https://cdn.sqhk.co/nixivezez/jicjhiX/90739429331.pdfIn PDF document text
    • http://bivoliku.mywebcommunity.org/gilinibipolesezagilew.pdfIn PDF document text
    • https://cdn.sqhk.co/ketifoseja/cGmPhan/modern_mania_wrestling_tag_teams.pdfIn PDF document text
    • https://cdn.sqhk.co/mepapogivoma/jdpiegy/95880807517.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/a9gcQii/magic_rush_heroes_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/gifexajed/jdYWjge/lujeroveg.pdfIn PDF document text
    • https://cdn.sqhk.co/xexanodu/1jjYpji/newitosid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5634f520-c25d-421d-ab67-3d94505d13cb.filesusr.com/ugd/1b85ab_7be01052d1a844cf8e761d4e46073587.pdf?index=trueIn PDF document text
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_e4722190e9e14b64b227b771f50c53e7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/96890167-5768-4225-a11c-3b79d05277f9/pemujalijal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a3c6d3d-0202-4b08-a9b6-037d133746f9/fibeled.pdfIn PDF document text
    • https://156bb51f-0b62-477f-88ca-8620af00812b.filesusr.com/ugd/e3ff21_de70423a880142f1a1df3147d7bfa532.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/da0a5cca-a515-44df-a58f-8833e35dbe67/jirinimuxesadije.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9bd1a87-0fb3-4fa3-be70-b7a5f3b16092/the_power_of_less_review.pdfIn PDF document text
    • https://012a8781-80b6-4d33-8f63-56d56ef93f15.filesusr.com/ugd/6d3794_b959e1d811144aeeabe4235f92b330ab.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7adca4e3-aa19-4d41-b164-dcd83e6e52c2/20106203561.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed09f4d0-55ed-4631-9b8b-1e14b7a0c5c4/is_dr_sleep_a_sequel_to_the_book_or_movie.pdfIn PDF document text
    • http://vunonam.atwebpages.com/xelor.pdfIn PDF document text
    • http://buzumigasox.myartsonline.com/digital_vernier_caliper.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_off0000dde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE8 5880 bytes
SHA-256: 572997cef5788b59cc433f60dabbc38c0cde1dea04674efb83634796b7c45ee5
font_01_sfnt_off0000f1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D7 10780 bytes
SHA-256: 74bb1f8d2fd782dead98480cbcd0d9eaa8d41e96208a854f24b407ac86f3e887