Malicious PDF — malware analysis report

Static analysis result for SHA-256 a056cd638fee9cfa…

MALICIOUS

PDF

81.7 KB Created: 2021-03-21 10:31:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25c6f6f1e458cc7cd1f3c9d4fbfafecd SHA-1: 11b9a1eec176172bbfd45e2d4002816091b3ec5c SHA-256: a056cd638fee9cfa25151bd9ffdf6ff1bea7331887e8f8c23606b2c013ed7440
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains a large number of external links, many of which are embedded within the document body, suggesting a link farm or redirection tactic. The presence of multiple PDF links and the overall structure indicate a potential phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/123?utm_term=dried+seaweed+sheets+calories
    • https://cdn.sqhk.co/bujomuvi/bBBifgc/mataxumofazutasasuzu.pdf
    • https://mazanotofubemiz.weebly.com/uploads/1/3/2/6/132681192/rajosakixa_jewetiruwima_xinezigalu.pdf
    • https://zexotanus.weebly.com/uploads/1/3/0/8/130873712/beramexor_tolarabej.pdf
    • https://pemugaladesav.weebly.com/uploads/1/3/5/3/135307247/vedonop-wibigimafe-xavonegaga.pdf
    • https://cdn.sqhk.co/wixefawoz/RxXRhcf/assam_new_mp4_song.pdf
    • https://cdn.sqhk.co/zodavujera/jbjejIo/43044134138.pdf
    • https://rigawegafo.weebly.com/uploads/1/3/4/5/134587157/lawakosadaj.pdf
    • https://nilizexuv.weebly.com/uploads/1/3/0/7/130739046/bece9d1ae.pdf
    • https://vizegibog.weebly.com/uploads/1/3/4/4/134458583/foretikale.pdf
    • https://dubozenerur.weebly.com/uploads/1/3/4/6/134687155/wirikizijofinoguwe.pdf
    • https://wukelefitifaka.weebly.com/uploads/1/3/4/8/134882985/7095819.pdf
    • https://goremafijitem.weebly.com/uploads/1/3/4/6/134617837/berumu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fekazudabo/analytic_geometry_parabola_problems_with_solutions.pdf
    • https://s3.amazonaws.com/wanasuvedigo/jegagiruximetadik.pdf
    • https://s3.amazonaws.com/pisik/81535824251.pdf
    • http://lavorusopanutaw.rf.gd/pikumadizezag.pdf
    • https://s3.amazonaws.com/potamotaz/fatehabad_weather_report_today.pdf
    • https://s3.amazonaws.com/takurugilij/mh_cet_2019_answer_key.pdf
    • https://s3.amazonaws.com/pasutiz/28547651611.pdf
    • https://s3.amazonaws.com/zomuzigo/programming_language_cheat_sheets.pdf
    • http://zapuwoz.epizy.com/rozizipizi.pdf
    • http://vejimugar.epizy.com/hipa_departmental_exam_2019_date_sheet.pdf
    • http://binusogug.rf.gd/60260479141.pdf
    • http://zenutetuzobo.epizy.com/business_policy_and_strategy_free.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_off0001042b.bin
c76c40f2e8edf063de74fc6d1acd15cb7325206b9f1c1c41b01da76dc39c7ac9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1042B 5120 bytes
font_01_sfnt_off000115a4.bin
ad90ab9c81eb0beba83ed519abaae2f268d2aff6129d92143a6fd1e17d7c365f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115A4 10484 bytes

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