Malicious PDF — malware analysis report

Static analysis result for SHA-256 92394bcdb62c36f2…

MALICIOUS

PDF

69.4 KB Created: 2021-04-13 17:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91ece5b7d16721e034efebe8fb6b1307 SHA-1: 55ee6e40bcc2f203fdfdd83caf9b89aaffb42ccc SHA-256: 92394bcdb62c36f2bdd5b74eebbc91239216df92978c8f5efaaac556f7b2e19d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many of which point to PDF files hosted on file-sharing services, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs suggest it's designed to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/strik?utm_term=elements+of+literature+fourth+course+pdf
    • https://gibimigiwu.weebly.com/uploads/1/3/4/7/134748980/2753498.pdf
    • https://cdn.sqhk.co/guwuweri/jaUiicm/83465319839.pdf
    • https://cdn.sqhk.co/futevanu/kgfjbge/ms_pac_man_game_boy_rom.pdf
    • https://jajonugofetafis.weebly.com/uploads/1/3/0/7/130776034/somigafuxog.pdf
    • https://kedaweva.weebly.com/uploads/1/3/4/8/134895813/dorupod_wuseritogatuzod_dubifoxelubutak.pdf
    • https://cdn.sqhk.co/mareduviger/UjbhiUw/polygon_puzzle_magic_artifacts.pdf
    • https://cdn.sqhk.co/fejovuwov/aheVjcU/download_pinkfong_baby_shark_muffin_remix.pdf
    • https://cdn.sqhk.co/novoganug/gejcTjg/zonobadawawuwi.pdf
    • https://cdn.sqhk.co/tovipovo/Ho6hces/archery_gameplay_overhaul_rings.pdf
    • https://cdn.sqhk.co/lipepolutew/ghifAjc/clocks_coldplay_drum_sheet_music.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cea52ffe-6ed4-498a-9f55-7f1b05c594cd/dish_hybrid_lnb_wiring.pdf
    • https://uploads.strikinglycdn.com/files/864237ad-f66b-4e41-a9c3-9cead3c27109/hp_officejet_pro_8610_single_sheet_feed.pdf
    • https://uploads.strikinglycdn.com/files/20d0fe25-7ac5-4eaa-ac01-f36615a58362/how_much_does_enterprise_charge_to_rent_a_car_for_a_day.pdf
    • https://uploads.strikinglycdn.com/files/a376734c-7608-4488-8378-9036815f412a/88739374795.pdf
    • https://uploads.strikinglycdn.com/files/1f95b267-3ed9-4770-b05e-3c003dc688cb/jafixu.pdf
    • https://s3.amazonaws.com/jupudizadid/2415372167.pdf
    • https://s3.amazonaws.com/sepovutapakogaf/zuzadazuxilikajokaxu.pdf
    • https://s3.amazonaws.com/vosimalume/51174221025.pdf
    • https://uploads.strikinglycdn.com/files/8936e6c0-8d40-40e4-9e19-e259fe73b370/penaxire.pdf
    • https://uploads.strikinglycdn.com/files/b7291e49-1f25-402a-b190-d26875894182/the_giver_chapter_10_summary.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3d0.bin
b6692716f002dc24a862800893a4862603ae2432f46cfc88e8690d69e77cbcbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D0 5352 bytes
font_01_sfnt_off0000e5d7.bin
4880862ba8d2132bdbcb109e6da820a022ed5938f0e9aa353730695b7e0e4e6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D7 10088 bytes

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