Malicious PDF — malware analysis report

Static analysis result for SHA-256 c32236915f4da30e…

MALICIOUS

PDF

79.2 KB Created: 2021-03-17 11:44:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbded98607052a7eb695d6cb2b5d0a83 SHA-1: d403b0c698b669872e9119e1e82f8ad1b1b91ae5 SHA-256: c32236915f4da30ea722b48c52e89286c3c42004409a21422d6015ee0069fa82
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing campaign. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of numerous external links and the overall detection profile points to a malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/wix?keyword=remo+recover+5.0+keygen
    • http://wewedaz.iblogger.org/49524079053.pdf
    • http://legegapepapo.medianewsonline.com/hydraulic_pneumatic_system_in_automation.pdf
    • https://vedalamiru.weebly.com/uploads/1/3/0/7/130776143/2790873.pdf
    • http://devigebogubiret.getenjoyment.net/saxadegof.pdf
    • http://nulatapukedu.scienceontheweb.net/siditidu.pdf
    • https://pokumowudo.weebly.com/uploads/1/3/0/7/130740164/1badbaf85ef.pdf
    • http://zugapuvu.mywebcommunity.org/chamberlain_universal_remote_genie_intellicode.pdf
    • http://bupomorefa.22web.org/camera_vector_png.pdf
    • http://disozire.mygamesonline.org/7214086495.pdf
    • http://pogawubujogeje.mypressonline.com/nanuz.pdf
    • http://tibagisuminove.sportsontheweb.net/rijonuzexoleriz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wixanarer/edulastic_answers_key.pdf
    • https://s3.amazonaws.com/wavunot/sikakujupavuvu.pdf
    • https://s3.amazonaws.com/sefabe/jedalo.pdf
    • http://putesedesupelo.epizy.com/bajirao_mastani_full_movie_1080p_khatrimaza.pdf
    • http://jugikan.epizy.com/listening_test_1_crime_report_form_answers.pdf
    • http://dakezemafatelo.epizy.com/dibajadepepibepates.pdf
    • https://s3.amazonaws.com/xotomisen/jowisavafavaraxiniganafum.pdf
    • http://muvekalufisu.atwebpages.com/english_crossword_puzzles_with_answers_for_class_3.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f827.bin
6faa1cea26d7cdb0c4325d58502ef9446a194c1b5c0e82d0eccac70827fa89c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF827 5232 bytes
font_01_sfnt_off00010a08.bin
1d98b5939695a58994c03aa1b48b481959a912cb73dee7ee9c4f2fd7f98144c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A08 10972 bytes

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