Malicious PDF — malware analysis report

Static analysis result for SHA-256 03807697c5a25c76…

MALICIOUS

PDF

76.2 KB Created: 2021-04-05 03:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2642c413544996a7849cfe96a56b20db SHA-1: 858929e2639d5087d6c72f09d0186758643248b4 SHA-256: 03807697c5a25c76fecf39225288497c84951902d5811a79e77acc99d27f4e72
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 0.9998

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://dugedepap.ru/wix?keyword=nba+2k15+defense+controls PDF link annotation
    • http://dipenoguzel.sportsontheweb.net/vb._net_download_file_from_server.pdfIn PDF document text
    • http://vizazovabula.mywebcommunity.org/fossil_q_explorist_gen_4_bands.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzemesafe/y6ifVXK/ai_dungeon_list_of_commands.pdfIn PDF document text
    • http://miwuzobi.sportsontheweb.net/cantico_delle_creature_san_francesco.pdfIn PDF document text
    • http://xapowuxif.mywebcommunity.org/habanera_violin_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/tanusulirava/eD3pige/guitar_chords_ghost_riders_in_the_sky_outlaws.pdfIn PDF document text
    • https://cdn.sqhk.co/niramojiga/VZhbgcW/sapapivegasoxop.pdfIn PDF document text
    • https://cdn.sqhk.co/mavozopofug/gigHuA2/bts_fake_call_with_love_photoshoot.pdfIn PDF document text
    • http://dazolovegom.mygamesonline.org/wokuwepazaketatagodame.pdfIn PDF document text
    • https://cdn.sqhk.co/nixibaraje/mjcggKq/xisupilanotife.pdfIn PDF document text
    • https://latavulepa.weebly.com/uploads/1/3/4/4/134461708/6a2df3e1c.pdfIn PDF document text
    • http://jajolamuseku.medianewsonline.com/capitalism_in_the_twenty_first_century.pdfIn PDF document text
    • https://tozubovudifudi.weebly.com/uploads/1/3/5/9/135973827/365346f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zosevid/delijulin.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/mopafofasegu.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/comptia_network_study_guide_free.pdfIn PDF document text
    • http://dafukip.myartsonline.com/vanosazubuxaxesuni.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_off0000ec34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC34 5496 bytes
SHA-256: 4b1ec061dbe574b9cd3e5608e0fd5a2d9a7db434c4cfd51e9ffc1d96289b98ee
font_01_sfnt_off0000ff0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0D 10856 bytes
SHA-256: 9ff360bd9e326fa3270740f734176c39f7f2a115336b6e26b8e71de86cca65f5

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