Malicious PDF — malware analysis report

Static analysis result for SHA-256 87768fd9f5cbcc4b…

MALICIOUS

PDF

78.3 KB Created: 2021-02-18 06:13:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: dcb56c90f317c02deb76143b086e163d SHA-1: 532b0ffd00614aa58621ff2628e61841fecd52b9 SHA-256: 87768fd9f5cbcc4b052ea9f0fd0e17cff740d0b569f2be6e67867e784ef45362
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable hosting and known malicious redirectors, indicating a phishing or malware distribution scheme. Heuristics confirm the presence of malicious redirector links and a link farm strategy. While no scripts were explicitly extracted, the nature of the embedded links and the ML classification strongly suggest exploitation for client execution, likely via a PDF vulnerability or a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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 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://yafferge.ru/123?utm_term=how+to+start+toro+power+curve+1800 In PDF document text
    • https://cdn.sqhk.co/tororukiwuri/a5ihtfO/warriors_cats_characters.pdfIn PDF document text
    • http://vawuzusodiguse.iblogger.org/gabofozojimiriroxuzabif.pdfIn PDF document text
    • http://hiziryigit.online/adobe_universal_patcher4okrt.pdfIn PDF document text
    • http://zalavsky.ru/pizibulexe2qnk7.pdfIn PDF document text
    • http://gufutaca5.xyz/catapult_king_apk_mod_revdl6m7fn.pdfIn PDF document text
    • https://cdn.sqhk.co/xobakidanav/7ZyQib0/how_to_make_anything_fullscreen.pdfIn PDF document text
    • https://cdn.sqhk.co/kajurineg/dhckpgh/26448549064.pdfIn PDF document text
    • https://cdn.sqhk.co/nepusoliweda/hfCtDRx/kobini.pdfIn PDF document text
    • http://nenotuwafuxigot.22web.org/servant_leadership_robert_greenleaf_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/goberirud/jhf6mhi/sandeep_maheshwari_wife_neha_biography.pdfIn PDF document text
    • http://spainwow.pro/momosiwosdoip.pdfIn PDF document text
    • http://vejawezodasupax.22web.org/81544524511.pdfIn PDF document text
    • https://cdn.sqhk.co/metexemoraga/djgIwje/wwe_rock_ringtone_mp3_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/popilo/code_vein_ichor_guide.pdfIn PDF document text
    • http://zilokujidetomo.epizy.com/despacito_song_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/kenimozajilasujuwe.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/1812890834.pdfIn PDF document text
    • http://jizuwugi.rf.gd/guild_wars_2_crafting_guide_cooking.pdfIn PDF document text
    • http://senapofo.epizy.com/least_common_multiple_worksheet_kuta_software.pdfIn PDF document text
    • http://josegofubusem.epizy.com/kaxesaxijil.pdfIn PDF document text
    • http://zusutifosaj.rf.gd/cadence_virtuoso_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE671 5124 bytes
SHA-256: 01863a4b0d63f59858a178a8306e2a3a030ce9ea85919bc094ac52c5305d9f77
font_01_sfnt_off0000f806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF806 11204 bytes
SHA-256: 4f24c7d41038ad832a5cf51c70f2f77e5da0f0a365e0c7afb22caa949dbfd2b3
font_02_sfnt_off00011d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D61 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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