Malicious PDF — malware analysis report

Static analysis result for SHA-256 f413acf6b7f88c4b…

MALICIOUS

PDF

84.3 KB Created: 2021-01-24 14:19:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a78b350fd8dc93cf0f6805a3d40af774 SHA-1: b79a17b727b84cb79aac18bbd8a82d3e40b89396 SHA-256: f413acf6b7f88c4b45b77b4e49d352eb5d75fd92df546616969b9a6ca2aa251b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which are obfuscated or lead to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM and PDF_URI heuristics. ClamAV also detected this file as Pdf.Phishing.Trojan, and ML classification strongly suggests maliciousness. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it may be a generated document used to mask malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://jottigo.ru/123?utm_term=the+dark+eye+bestiary+pdf PDF link annotation
    • https://cdn.sqhk.co/tiwumixe/Vhg4Vii/business_card_creator_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/lediname/YnNjgXq/zejejunepokomunekulamado.pdfIn PDF document text
    • https://cdn.sqhk.co/wifurovud/icjhBja/puporojubuge.pdfIn PDF document text
    • https://cdn.sqhk.co/lilomovetum/f9KVgjB/lifuliperefej.pdfIn PDF document text
    • https://cdn.sqhk.co/gafisasiwu/ihfZhhX/vetaworikufuvixoxudigetej.pdfIn PDF document text
    • https://cdn.sqhk.co/pazaxefuma/agccz9m/jail_simulator_game_online.pdfIn PDF document text
    • https://cdn.sqhk.co/rilowikapaz/3dXjejh/xelubirumanizax.pdfIn PDF document text
    • https://cdn.sqhk.co/riragimi/bm8h6gh/14736621285.pdfIn PDF document text
    • https://cdn.sqhk.co/musutalivun/6R5gejd/tozimorevadanugatixutu.pdfIn PDF document text
    • https://cdn.sqhk.co/woteruzid/90Jihzq/mijirudesudixuda.pdfIn PDF document text
    • https://sevexuwajewedov.weebly.com/uploads/1/3/4/5/134508994/risuvazepipibi_fajiruw.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/jajoxulabojaso/adobe_photoshop_cs_7._0_free_filehippo.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/carrom_disc_pool_latest_version_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/zubata/jutamoruwatuwojelumuri.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/21805333508.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/60060564322.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_off00010e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0F 5352 bytes
SHA-256: 24d72427022f7ce0f5d233bd4305509826d07ccb78786a144476a13e1fa36984
font_01_sfnt_off0001203a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203A 10364 bytes
SHA-256: 458a50ad568c74ee96199bab6a79c7026df4e075f5c1c5cd98dfbbc579033fb7

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