Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef2f1a3d964111a…

MALICIOUS

PDF

79.7 KB Created: 2021-01-01 00:06:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e097908373486b029f3cbcc73ae575a2 SHA-1: e61dcc5008147e3e58f06925372a5ed8efca542b SHA-256: 3ef2f1a3d964111a0e3a4876297efc8365b28e3d12d460af3084100877544254
254 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are identified as redirectors to malicious infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a pattern of linking to potentially harmful sites, disguised as legitimate downloads. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://gettraff.ru/strik?utm_term=freebies+uk+by+post+2019 In PDF document text
    • https://cdn.sqhk.co/zatufora/gd8VG9k/gatejavazovurixevemaxir.pdfIn PDF document text
    • https://negowuvezesat.weebly.com/uploads/1/3/4/8/134859399/piforexakijop_witowipuja_pomepusuvitok_bupibitawa.pdfIn PDF document text
    • https://cdn.sqhk.co/varomapit/pOjfjaS/nightfall_armory_phoenix.pdfIn PDF document text
    • https://cdn.sqhk.co/vipabure/6HtggTD/jagafene.pdfIn PDF document text
    • https://fojigexo.weebly.com/uploads/1/3/4/2/134235048/784168.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/map_of_aztec_empire.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/calgary_city_map.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/ganedawonok.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/game_catalogue_september_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/74361680484.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/laloze.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/icsharpcode._sharpziplib._dll_0._86.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/63594457303.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74A 5316 bytes
SHA-256: 7fe1211bcf3bbbf90e97af4640ddbeba00687df34e8bbe7bb6ab822c84da4a23
font_01_sfnt_off00010979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10979 11612 bytes
SHA-256: 37dd3254b45fcc1cb55ccb6f055252855a8265834af611437619933c954ad842

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