Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c28032b639e1002…

MALICIOUS

PDF

81.2 KB Created: 2021-02-24 04:48:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 1bf2434f85b115dc86ba03fe05e7fb6a SHA-1: f63d3e20baaf7fe942c3eebd51c19dba30823237 SHA-256: 4c28032b639e1002cdc37627bf23c1de400c3c4ccf66222bea4a234731fa59d4
186 Risk Score

Malware Insights

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

This PDF contains a large number of external links, a technique often used for SEO manipulation or to distribute malicious content. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate this malicious intent. While no scripts were explicitly extracted, the presence of numerous unknown-reputation URLs suggests a phishing or malware distribution vector, aligning with the ClamAV detection of 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/wix?keyword=the+black+swan+summary+pdf PDF link annotation
    • http://gufutaca1.xyz/c_major_scale_worksheetzc2cd.pdfIn PDF document text
    • http://virona.org/on_my_block_cast_spooky_brotherab09c.pdfIn PDF document text
    • https://revunisukigi.weebly.com/uploads/1/3/4/8/134849871/670002.pdfIn PDF document text
    • http://llloooodddd.space/dummit_and_foote_abstract_algebra_3rd_editionofayd.pdfIn PDF document text
    • http://rating-bookmaker.ru/press_reporter_and_journalistc4fuy.pdfIn PDF document text
    • https://cdn.sqhk.co/pufuxogife/euAPBkZ/last_island_of_survival_mod_menu.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/jhKidhf/best_game_creator_software_for_pc.pdfIn PDF document text
    • http://andyhong.blog/kenmore_progressive_vacuum_cleaner_model_116_manualyyd27.pdfIn PDF document text
    • http://abreudesigns.com/zarunovatoghmb3j.pdfIn PDF document text
    • http://expo-kit.ru/22520730911tpf1e.pdfIn PDF document text
    • https://cdn.sqhk.co/pifonode/gcjhBhi/offline_gps_map_apps_for_android.pdfIn PDF document text
    • http://hangookoil.ru/renisexatujidow42py.pdfIn PDF document text
    • https://cdn.sqhk.co/bureruverog/gifUjiW/brick_breaker_classic_online.pdfIn PDF document text
    • https://cdn.sqhk.co/vadetegubufo/gjaieKY/97393752757.pdfIn PDF document text
    • https://tujupanex.weebly.com/uploads/1/3/5/3/135333196/6639001.pdfIn PDF document text
    • https://cdn.sqhk.co/gudijupimeb/gjgjbSB/wurewaramutodob.pdfIn PDF document text
    • https://kofosobi.weebly.com/uploads/1/3/4/5/134528260/b5f74a8fb08.pdfIn PDF document text
    • https://cdn.sqhk.co/ladesajisama/jhohdOk/58794723064.pdfIn PDF document text
    • https://panasijizikefiz.weebly.com/uploads/1/3/4/4/134446590/riwosejor-xijidaxosa.pdfIn PDF document text
    • http://lnstagramcopyrigtservice.com/norcold_rv_refrigerator_code_l1_op59dhe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000fe9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9F 5744 bytes
SHA-256: 86e9f5e59be78cc0dea3757a48726784e2ef09dc8e8057da2db37a7f958de701
font_01_sfnt_off00011209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11209 11020 bytes
SHA-256: 964c091bc3a3b89449562a83b3f41fad05702f24341f7325fbd560b60acb9619

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