Malicious PDF — malware analysis report

Static analysis result for SHA-256 a58c202f04c847a9…

MALICIOUS

PDF

78.9 KB Created: 2021-03-10 23:38:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4459e978cf209f94e2c0aec2374b76ad SHA-1: 77103e6bf8a8dd3095e358891901a19d1db3c208 SHA-256: a58c202f04c847a94d59c5f0d997e79c0e740287ba1d583ee985ef04d0505d81
156 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, containing numerous external links to other PDF documents, likely as a tactic to improve search engine ranking for specific keywords. The presence of a critical heuristic firing for 'PDF_SEO_LINK_FARM' and a high ML score strongly indicate malicious intent. The embedded URLs suggest a phishing or content-luring scheme, aiming to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://mezovuduw.ru/wix?keyword=girl+boss+pdf+free+download
    • http://vubitim.sportsontheweb.net/87012922827.pdf
    • https://sosanibizug.weebly.com/uploads/1/3/2/6/132695556/c13507f.pdf
    • https://zanobevaduj.weebly.com/uploads/1/3/2/6/132682049/1b22f7dc.pdf
    • https://xitukamobem.weebly.com/uploads/1/3/4/6/134643312/8469550.pdf
    • http://rarurude.22web.org/high_school_community_hours_sheet.pdf
    • http://csxmoney.info/fapilepowizidana3sc3p.pdf
    • http://fogafiv.mypressonline.com/how_to_use_a_lean_mean_fat_grilling_machine.pdf
    • http://arendagg.xyz/gowoxavuzixibr.pdf
    • http://dikiradojasika.iblogger.org/15769678403.pdf
    • http://razoxibawig.22web.org/acoustic_guitar_songs_for_beginners_tabs.pdf
    • https://modibabebala.weebly.com/uploads/1/3/5/3/135340426/zugebode.pdf
    • http://ogranicbio.fun/the_promised_land_piano_sheet_musiczot8h.pdf
    • http://aydym.club/lukerosepimetavolmyr63.pdf
    • http://jedomagisuw.getenjoyment.net/american_declaration_of_independence_1776_summary.pdf
    • http://liwurivosopap.medianewsonline.com/hindi_film_script_writing_book.pdf
    • http://lofuzuwe.22web.org/what_is_sepsis_secondary_to_pneumonia.pdf
    • https://kaxogirigajel.weebly.com/uploads/1/3/4/6/134611066/6ad60ba1d3e8d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vuwamim.rf.gd/gutegejinesokika.pdf
    • https://2c3f863e-7833-479a-ae3e-a3e802aa914d.filesusr.com/ugd/e2f197_476a769cd632420c9c8922cda4cfd4d9.pdf?index=true
    • http://ligixuz.rf.gd/skyrim_crashing_on_startup_after_installing_mods.pdf
    • http://penisidisipifo.rf.gd/how_much_does_a_toto_toilet_cost.pdf
    • https://4541bc1c-e35c-4de3-bb44-1f53c3e1a56d.filesusr.com/ugd/68f66e_c56e5c6384884d54bed0bb414b03cd72.pdf?index=true
    • http://wafepedowixe.rf.gd/crazy_love_song_versions.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_off0000f81a.bin
16db4cde0d3ca10c3073b834f40e17a5c91e1b4617770a91efbf4062244e3384		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF81A 5296 bytes
font_01_sfnt_off00010a3b.bin
ccb692dc9ed73a57bc2b8afabf146977c5b222e7cfb18a9c578f8564f5885938		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3B 10608 bytes

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