Malicious PDF — malware analysis report

Static analysis result for SHA-256 2639454e6297130e…

MALICIOUS

PDF

73.4 KB Created: 2021-04-02 14:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: be3d535838db28ce55ece0803072730c SHA-1: aad81d19e3970553360e199120c139604b868613 SHA-256: 2639454e6297130e00aff726c6b1ca294f3794a1d2f84683fb7eec6e98de8196
126 Risk Score

Malware Insights

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

The PDF contains multiple URLs pointing to disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gimoguvi.ru/strik?utm_term=hp+laserjet+pro+400+color+m452nw+toner PDF link annotation
    • http://quickpapp.online/partenogenesis_pada_lebahm1cb6.pdfIn PDF document text
    • http://mkr-olimp.info/free_offline_games_for_kids_no_downloadcuaoz.pdfIn PDF document text
    • http://zahlungsservice-ch.site/37215048484l6qws.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493553/normal_5fce95e4542c4.pdfIn PDF document text
    • http://pajuwepubawip.sportsontheweb.net/ignou_assignment_front_page_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365552/normal_603164c9a4b28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420752/normal_5fd157fc48b0f.pdfIn PDF document text
    • http://milatepe.medianewsonline.com/liwejoros.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/37605dc4-4f3a-4f61-8a3a-8bfb87cafaf7/wawosarapamu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5be29883-5b0e-4efb-a04c-98550d13f386/vodelukugikaru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fae1f3e-28c3-43f1-921b-36eaaa1c8678/is_the_braun_thermoscan_7_for_adults.pdfIn PDF document text
    • http://kadanokadija.epizy.com/powatesonolulevepele.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56445695-7ed5-4878-969d-1a3e75adfb0d/craftsman_edger_trencher_parts.pdfIn PDF document text
    • http://zepurudevivo.rf.gd/21920167407.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE056 5692 bytes
SHA-256: 2c17d5875f96e93bf1d1b40cfb4f794d4c6eb36678fb32d20c3e9ec39acd0067
font_01_sfnt_off0000f3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BC 10884 bytes
SHA-256: 0246c88517671a8a8e741602d777d61a262beec57555731228bb7bccf4a97951

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