Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ba2481dff962497…

MALICIOUS

PDF

75.5 KB Created: 2021-03-20 18:36:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01c661e08ade6c3e1bc4d7a0cc7660f8 SHA-1: bfe44fd232ed81a2f2ec3b1325a3ee0d43e37fa4 SHA-256: 2ba2481dff9624971afcc9f4541fd714820017c756fa7e1559a01ed1e8abf056
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. The presence of a large number of external links, many with numeric or article-like slugs, suggests a link farm or SEO poisoning tactic to distribute malicious content. While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics strongly indicate it's designed to redirect users to malicious URLs for further compromise.

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://pelibifir.ru/aws?utm_term=formato+de+inspeccion+vehicular+mantenimiento
    • http://vizenam.medianewsonline.com/18405715038.pdf
    • http://lorozetuwivu.medianewsonline.com/how_do_you_apply_for_the_chick_fil_a_scholarship.pdf
    • https://rifijilaguselud.weebly.com/uploads/1/3/4/8/134846829/b0594a20e12884.pdf
    • https://cdn.sqhk.co/fotutubujuf/nZUIhis/73148808108.pdf
    • https://difototasewi.weebly.com/uploads/1/3/5/9/135986065/butokegolabu-dobijebigolaze-julelan-jezalikimimim.pdf
    • https://basuxujazako.weebly.com/uploads/1/3/4/4/134467371/1544f.pdf
    • https://cdn.sqhk.co/kuzetuzame/ugjxxqG/hypoxic_ischemic_encephalopathy_in_newborn.pdf
    • https://tovexalo.weebly.com/uploads/1/3/5/3/135348509/4312e6.pdf
    • http://kavelizopepi.mywebcommunity.org/brown_wiener_dog_names.pdf
    • https://cdn.sqhk.co/panosiritu/whgEid5/dunabavijogutevuwekuseveg.pdf
    • https://cdn.sqhk.co/rekubapapup/bHginz0/directv_now_packages_channels.pdf
    • http://gepanukotex.getenjoyment.net/mapa_turistico_portugal.pdf
    • https://cdn.sqhk.co/tamejenonisi/bgjhiTI/exonerate_in_a_sentence_yahoo.pdf
    • http://kismyketio.com/global_cash_card_app_sign_upuc2sn.pdf
    • https://sasofisapen.weebly.com/uploads/1/3/4/5/134590640/7c8b10.pdf
    • https://cdn.sqhk.co/kunimanujage/iSghpmG/31553533092.pdf
    • https://cdn.sqhk.co/kidatufo/bycKicW/8855065710.pdf
    • https://cdn.sqhk.co/mofipife/ctnzgeP/vewatitamax.pdf
    • https://cdn.sqhk.co/xawefigi/jjc6gib/demadogepu.pdf
    • https://notesorujul.weebly.com/uploads/1/3/1/4/131407176/5425319.pdf
    • http://helplnstagramcontact6088756.com/jevakipuceshr.pdf
    • https://namovisurov.weebly.com/uploads/1/3/5/3/135338224/tofujegu.pdf
    • http://topcreditreport.info/probability_model_statistics_definitiono2woj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000e52f.bin
61aafdf5618b2897dd4557e19991fd3d32f7c8977652c7129a1c7bc9551ae451		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE52F 5328 bytes
font_01_sfnt_off0000f728.bin
5dfae5e26a5eea1bc2b0e65e23b74318f5987d0f07493cfa2c08098b2259aebe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF728 12128 bytes

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