Malicious PDF — malware analysis report

Static analysis result for SHA-256 1239a549613d9c98…

MALICIOUS

PDF

83.9 KB Created: 2021-03-15 07:19:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6f72205f7906d7b615c81b044d248a9 SHA-1: 905a5798a4746b9a541365c62ca56cc10aa3e1cc SHA-256: 1239a549613d9c9825c95d4dc803c35a4323dc8ce4051b1293023fe54390cb0f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful content.

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://midufefew.ru/wix?keyword=acura+tl+type+s+6+speed+manual+transmission
    • http://fobexugelego.getenjoyment.net/74442791530.pdf
    • http://rikafitamedad.medianewsonline.com/fupoguluvulu.pdf
    • http://pogawubujogeje.mypressonline.com/english_idioms_in_use_intermediate_book_with_answers_vocabulary_reference_and_practice.pdf
    • http://curvepreloved.com/musapurvsmd4.pdf
    • http://rubisteq.online/k_hits_100._9_ctqthq7.pdf
    • https://cdn-cms.f-static.net/uploads/4479224/normal_5fd17364c380a.pdf
    • http://zizodoroluxonaf.sportsontheweb.net/which_statement_accurately_describes_the_concept_of_a_social_contract.pdf
    • https://cdn-cms.f-static.net/uploads/4384149/normal_6036bdeb29392.pdf
    • https://static.s123-cdn-static.com/uploads/4469852/normal_5fe32c63b6604.pdf
    • https://ronewomiz.weebly.com/uploads/1/3/0/8/130874064/4d803bdb655f9dc.pdf
    • https://cdn-cms.f-static.net/uploads/4483082/normal_60326681d7556.pdf
    • https://cdn-cms.f-static.net/uploads/4413575/normal_60210da45abfb.pdf
    • http://gilelugojes.iblogger.org/75763085757.pdf
    • https://static.s123-cdn-static.com/uploads/4530868/normal_5fe3a46f905df.pdf
    • https://rapinawenag.weebly.com/uploads/1/3/0/9/130969945/6531067.pdf
    • http://afracheat1.xyz/brandon_lee_sandydeizt.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wavexijazibivat.myartsonline.com/newborn_jaundice.pdf
    • http://vuxifonodine.epizy.com/5441553339.pdf
    • http://dowinoxerirud.epizy.com/47214008011.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f124.bin
52ff610f1ab5fbc03b07d6331e19b3147e0ac40b98341ec3928b03fbfa300e69		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF124 5464 bytes
font_01_sfnt_off000103ad.bin
bc8b4b866537c66feafa9902cea27006bae1b62945c8b57ae8c612c08fd7a5ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103AD 11644 bytes
font_02_sfnt_off00012b37.bin
0a33b3f77ddef7ca1e01daa6842a3f454ddc90f7f434264fc125f172323ad3c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B37 16088 bytes

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