Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ec30a3efec5c424…

MALICIOUS

PDF

81.4 KB Created: 2021-03-04 06:14:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d04e613424a959e08de4f185b2fe1160 SHA-1: e72a8a33fd8c09891ceb265b2038d1cfcc63a612 SHA-256: 4ec30a3efec5c424ac18a17c1c13e2a7f588e5452d9caaad649e195108057df8
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • 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://leonvi.ru/123?utm_term=types+of+expository+writing+structure PDF link annotation
    • http://nutosuvitiraj.scienceontheweb.net/vivusa.pdfIn PDF document text
    • http://fibisazorowax.mypressonline.com/managerial_accounting_13th_edition_chapter_14_solutions.pdfIn PDF document text
    • http://store50off.info/2011_nissan_juke_service_manualvyw5m.pdfIn PDF document text
    • https://cdn.sqhk.co/letareximo/izoijdk/fivukezixuzujimujexi.pdfIn PDF document text
    • https://cdn.sqhk.co/jimavidozeze/1Nidx2Y/66488205087.pdfIn PDF document text
    • http://xenuven.22web.org/how_to_make_triangle_out_of_wood.pdfIn PDF document text
    • https://cdn.sqhk.co/rivinodati/gghigXh/space_agency_2138_jump_gate.pdfIn PDF document text
    • http://vitalia-transports.com/doxezagatupetdirud.pdfIn PDF document text
    • https://cdn.sqhk.co/lanuniwa/tgejgjd/music_player_with_lyrics_offline_apk.pdfIn PDF document text
    • http://xariketixagat.mypressonline.com/netgear_-_rangemax_n600_dual-band_wi-fi_router_manual.pdfIn PDF document text
    • https://jifilebipik.weebly.com/uploads/1/3/4/3/134375607/vetosopiganor.pdfIn PDF document text
    • https://cdn.sqhk.co/murafabu/eMq3ggg/25438156832.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tamakibegotilo.epizy.com/dry_reforming_of_methane_thermodynamics.pdfIn PDF document text
    • http://jigiwema.epizy.com/rosilomisem.pdfIn PDF document text
    • http://ralepixevoz.epizy.com/56799753846.pdfIn PDF document text
    • http://petilawunabebi.epizy.com/wegilifujoboxeras.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_off00010248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10248 5152 bytes
SHA-256: 985598754fe712d072f547cb01c5fd1e74d66aef287ca540d4c55044f9a475d9
font_01_sfnt_off0001140e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140E 10676 bytes
SHA-256: f78dcf2ce2bd69b1074686e9981a8412bd8daa2222a09312fb42c2ed39891852

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