Malicious PDF — malware analysis report

Static analysis result for SHA-256 a27a25019f775fbb…

MALICIOUS

PDF

65.2 KB Created: 2021-03-30 19:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7cefdec75aae6202b3e39452cbdfadf0 SHA-1: d0d64a8a20a199aa9a4fd66875bde033b7ea0159 SHA-256: a27a25019f775fbb1e9b093ac171439a0a5fcc5a4bfb8dfaf66e4d6d16ad3c38
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, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful websites. The ClamAV detection and ML classifier strongly indicate malicious content, specifically a phishing or trojan distribution attempt. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attack pattern designed to exploit user trust through deceptive content.

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://pelibifir.ru/award?keyword=accelerated+learning+in+practice+pdf
    • https://kukurako.weebly.com/uploads/1/3/5/3/135321284/govuwof.pdf
    • https://cdn.sqhk.co/furigelo/8iiGvjj/last_minute_carnival_cruise_deals_from_baltimore.pdf
    • http://telovajov.medianewsonline.com/63520514762.pdf
    • https://cdn.sqhk.co/sesakiwewe/UfjVhit/food_wars_season_3_dub.pdf
    • http://greyfruit.space/the_hobbit_trilogy_book_serieswgakk.pdf
    • https://cdn.sqhk.co/duxisabaza/PcigNgj/symmetric_matrix_example.pdf
    • https://fupefasupemeze.weebly.com/uploads/1/3/4/3/134315788/rotedanopozeseto.pdf
    • https://kepubaxolawava.weebly.com/uploads/1/3/4/7/134703856/wakutonulugadejisep.pdf
    • https://taxikifa.weebly.com/uploads/1/3/4/4/134496463/53d024030e2.pdf
    • https://cdn.sqhk.co/segexiji/gjcgija/14179260822.pdf
    • http://bbcua.site/34714219889umlct.pdf
    • https://cdn.sqhk.co/jakatote/hOjahdV/soccer_league_football_game_app.pdf
    • http://kolagozisil.mywebcommunity.org/taramewe.pdf
    • http://paxijivatebul.getenjoyment.net/67188002654.pdf
    • https://cdn.sqhk.co/damukowabij/jdiedsR/offroad_bike_racing_game_download_uptodown.pdf
    • https://debinezituxi.weebly.com/uploads/1/3/4/3/134339783/18419a00a796.pdf
    • https://cdn.sqhk.co/kuwusemob/Cnjdbf2/international_marketing_notes.pdf
    • http://togaxifobuf.mypressonline.com/advanced_vocabulary_words_with_meaning_and_sentence.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wazotojemov/29119695286.pdf
    • https://s3.amazonaws.com/kagedatabujo/55795009879.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_off0000c517.bin
9b25a0499c8a3da0fbab079bf1ec6783ef97a322f35585eefc34e5d8a1c70573		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC517 5136 bytes
font_01_sfnt_off0000d69f.bin
7c5be279d6ab8188f3caba012b7c0d93b4e1008b3a647e8a57cb1ac45b9cf1a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD69F 9784 bytes

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