Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4373a82b5824f26…

MALICIOUS

PDF

67.3 KB Created: 2021-02-23 23:51:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 813fe28c11810e029f1796777a0084f6 SHA-1: 062db84ff840f1126264fa4d813b4e37a1ee9202 SHA-256: c4373a82b5824f26dcc6e9ba2e0f6e6bb19120b0945b82e990f375e589efe535
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which are hosted on disposable domains and utilize UTM parameters, suggesting a link farm or redirection scheme to deliver a malicious payload. The document body, though heavily obfuscated, contains keywords related to product manuals and search queries, reinforcing the lure-based attack pattern.

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
  • 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://jottigo.ru/strik?utm_term=pioneer+vsx+522+no+audio PDF link annotation
    • https://cdn.sqhk.co/tijinujul/Erjjtjk/uber_black_driver_salary_nyc.pdfIn PDF document text
    • http://lewabuvuk.22web.org/denon_receiver_turns_off_and_flashes_red.pdfIn PDF document text
    • http://silkhfig.bid/what_is_the_verb_form_of_listenmml1e.pdfIn PDF document text
    • https://cdn.sqhk.co/nawiwola/yHFrhbG/tap_tap_maze_dash_online.pdfIn PDF document text
    • http://fepemewavitik.66ghz.com/angularjs_route_templateurl_function.pdfIn PDF document text
    • http://allostar.buzz/does_maytag_top_load_washer_have_a_filternfxtl.pdfIn PDF document text
    • http://daxumokavokawu.iblogger.org/madozef.pdfIn PDF document text
    • https://cdn.sqhk.co/lomasamube/jbhaLWh/sazonidepakax.pdfIn PDF document text
    • http://klyshsheff.xyz/radifoxojabutalopalecf302.pdfIn PDF document text
    • http://nutesane.iblogger.org/26703929624.pdfIn PDF document text
    • https://cdn.sqhk.co/jufebarur/gigghYv/95015175242.pdfIn PDF document text
    • http://maddot.space/edible_history_of_humanityr6l5o.pdfIn PDF document text
    • http://kenufapozij.22web.org/tizadebopudodujojogo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rudavuvubizuz.rf.gd/vazesugopuduzixizo.pdfIn PDF document text
    • http://mujopoweter.rf.gd/hs1101_humidity_sensor_datasheet.pdfIn PDF document text
    • http://wazododasexixak.rf.gd/busbar_design_calculation.pdfIn PDF document text
    • http://kudogato.rf.gd/kobalt_air_compressor_20_gallon_manual.pdfIn PDF document text
    • http://nodimetonakijeb.epizy.com/tukakagavusuginebenekojaj.pdfIn PDF document text
    • http://relimimukavewuj.rf.gd/34330073460.pdfIn PDF document text
    • http://xitugukunorijiw.rf.gd/la_cancion_de_hielo_y_fuego_wiki.pdfIn PDF document text
    • http://suvemavukefejig.epizy.com/42369584992.pdfIn PDF document text
    • http://ruzizasasasami.rf.gd/nikirexup.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB64 5172 bytes
SHA-256: 5ff50741732720ee213e5821cd015382bc410b0e2bb29b422fdc0b7ffca1f98b
font_01_sfnt_off0000dd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD18 10176 bytes
SHA-256: 99c11d652d02f5973d526232c500409161c40dd1f531610d397af0ff67a174b5

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