Malicious PDF — malware analysis report

Static analysis result for SHA-256 526eb394e6feac0a…

MALICIOUS

PDF

69.7 KB Created: 2021-02-27 04:22:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: dc6fbc691fd8f7d74fcb8f28823cf5ba SHA-1: 049cfcb3fab648067e381b0849d63f6a0f88eb2c SHA-256: 526eb394e6feac0a8ded3f6cbe2a79c86b2faee48e7c9b916c94eeee5b0aa9f1
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting and redirectors, indicating a link farm for distributing malicious content. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a URL leading to known malicious infrastructure. While no scripts were explicitly extracted, the nature of the link farm and the ML classification strongly suggest the document's purpose is to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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.
  • 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/123?utm_term=fios+remote+doesn%2527t+control+volume In PDF document text
    • https://duwizule.weebly.com/uploads/1/3/4/6/134663296/4595997.pdfIn PDF document text
    • http://forovasax.medianewsonline.com/how_to_change_typewriter_ribbon_olympia.pdfIn PDF document text
    • http://qwertyujg.xyz/gta_san_andreas_para_psp_megaeyf3b.pdfIn PDF document text
    • https://bemitobiz.weebly.com/uploads/1/3/4/6/134681698/5611981.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459939/normal_60052318abc45.pdfIn PDF document text
    • https://mikedexe.weebly.com/uploads/1/3/1/4/131452733/4777476.pdfIn PDF document text
    • http://vivekawiga.sportsontheweb.net/schlage_keypad_deadbolt_blinking_red.pdfIn PDF document text
    • https://buralekareze.weebly.com/uploads/1/3/4/3/134326789/bakumam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411691/normal_5fc7f55cc5596.pdfIn PDF document text
    • http://bukupiduge.mypressonline.com/zavonak.pdfIn PDF document text
    • https://kimubewej.weebly.com/uploads/1/3/5/3/135329621/147d4d9bd0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377909/normal_601e8eaec2a3e.pdfIn PDF document text
    • http://rosutob.getenjoyment.net/reselurobi.pdfIn PDF document text
    • http://veruvipavopa.getenjoyment.net/dell_m6800_dimensions.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nojikigor.myartsonline.com/23332325934.pdfIn PDF document text
    • http://petojijoxura.onlinewebshop.net/murachs_mysql_3rd.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_off0000d609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD609 4924 bytes
SHA-256: 66b995e8f7945fb0d330a11922e54d82e7c623f7ab1e79e3b1dbb9e94e84a397
font_01_sfnt_off0000e6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C4 10148 bytes
SHA-256: 3af6f76390a95f1859465e42954527799c2ce3c766928ef58d78011ff9c1e854

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