Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc308a2ca57d660b…

MALICIOUS

PDF

75.3 KB Created: 2021-03-25 04:25:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ea075b58d87a3c05d47fea8d59024e82 SHA-1: 065708972a7158111d3ed721e0771c0e66cc85bf SHA-256: dc308a2ca57d660b2ff2a56ea0631de97c684b7a8b3bd8de3c4f485e3fbc41bb
214 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 external resources, a common tactic for link farms and phishing. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a link to known malicious infrastructure. While no scripts were directly extracted, the PDF structure and link farm suggest an attempt to redirect users to malicious sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 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.
  • 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://crophysi.ru/123?utm_term=information+richness+of+communication+channels+diagram In PDF document text
    • http://berozava.iblogger.org/ridetakoz.pdfIn PDF document text
    • http://reliables.ru/idle_monster_td_mod_apklg5yf.pdfIn PDF document text
    • http://vekvelo.ru/49460695330o1vub.pdfIn PDF document text
    • http://snatural.space/275880404111surx.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/gosete/32484569392.pdfIn PDF document text
    • https://0e627107-309b-4451-a84d-e7064c41fccd.filesusr.com/ugd/04c368_d07926f39f6844749466a90ba3bf3dbb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c25add7-abbe-44b6-a24c-c0d8c1925a5e/notaborogiwimanop.pdfIn PDF document text
    • http://besigaku.epizy.com/nikujupigovipapul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ab2616c-0242-47a7-b608-229df58f1a3e/90347672558.pdfIn PDF document text
    • http://kunimaz.rf.gd/ejemplos_de_dispositivos_de_proceso_de_hardware.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/equity_asset_valuation_3rd_edition_test_bank.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/47439701412.pdfIn PDF document text
    • https://77ac2d45-d533-4b4b-a85c-01e81860bff9.filesusr.com/ugd/7f1ad7_6b997df8e6d1402da7bed785657754e9.pdf?index=trueIn PDF document text
    • http://tirevotijo.epizy.com/upcoming_bollywood_movies_trailer_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cbf1e32-2eaa-4589-8913-13c37cc1b4c9/frosty_the_snowman_song_writer.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/say_it_again_dexter_meme_template.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_off0000e5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CB 5372 bytes
SHA-256: 79732d2153a4e453c1d1412bcfec484e24c85880a8492e422561ad9e696b865e
font_01_sfnt_off0000f7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E4 11176 bytes
SHA-256: 38dbb4db35cafcb3656caf3e93e1c966406fa49b6be397a5f10ab56b5fd208db

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