Malicious PDF — malware analysis report

Static analysis result for SHA-256 9964feee52b80ff7…

MALICIOUS

PDF

134.6 KB Created: 2021-03-09 12:26:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78e65436cf7ae38b7ee01c90c6704cf3 SHA-1: 55fdd01e6799443e1e4d71526ee62aabadd785e6 SHA-256: 9964feee52b80ff738a2a3fb1cc726913572b77237934740b1f5dfbb90aedfad
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a large link farm intended to generate traffic or distribute content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

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://dafemum.ru/award?keyword=clinical+chemistry+review+pdf
    • http://doordash.link/ice_princess_lily_trailerr7svb.pdf
    • http://theplafond.xyz/8496268856230ka.pdf
    • https://divowugu.weebly.com/uploads/1/3/6/0/136022164/30c9775dc342.pdf
    • http://fastgetme.online/lorebado7tvzy.pdf
    • https://jofanota.weebly.com/uploads/1/3/2/3/132302765/3856743.pdf
    • http://wodekenizowa.getenjoyment.net/pals_certification_nyc.pdf
    • http://degifutuv.scienceontheweb.net/18168537788.pdf
    • http://sawedes.mywebcommunity.org/33348759279.pdf
    • https://ruputosara.weebly.com/uploads/1/3/4/4/134456906/lorixebizerabuvemoka.pdf
    • https://dojinutek.weebly.com/uploads/1/3/4/1/134108596/3644479.pdf
    • https://wipedevibenisi.weebly.com/uploads/1/3/5/3/135315865/rigafufuponem.pdf
    • http://igme.site/76885506575ojv1n.pdf
    • http://nadefememidep.medianewsonline.com/the_tax_collector_film_2019.pdf
    • https://tujeliwavujojow.weebly.com/uploads/1/3/5/3/135304707/kofotufu_tadomegizoragul_gerizokiwamo_getiw.pdf
    • http://ketoxitigojaluk.sportsontheweb.net/werezugipibu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5e54d98c-4257-4cc7-9010-48f3df296eb2.filesusr.com/ugd/05240c_66a1be7339ee45f3a00faa1078fba1d0.pdf?index=true
    • https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_5cb9342c33df4cc9bad68694decfbf73.pdf?index=true
    • https://a2fe464c-28d1-4db8-bb2d-552ad9bc2f4d.filesusr.com/ugd/941bb1_878dc61fb0d34df9921790d82aa83fd2.pdf?index=true
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_3186a50d1a5c49539086e934ab0ff537.pdf?index=true
    • 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_off0001d2f5.bin
bb13678c479e68e7227689f12730af7bbc5eb796c29455935c3192ac6eef3a40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D2F5 5556 bytes
font_01_sfnt_off0001e5c4.bin
2b450a78fbf58e7689bf190b074477de25c0181d0da06850718fd1f63a51b29a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E5C4 11548 bytes

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