Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2fe2e54d1af9681…

MALICIOUS

PDF

79.6 KB Created: 2021-03-28 21:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3ab06f99eb7aa87547af006b7aa7f504 SHA-1: 105fd1b309c50ab67ae3156386a7f42adbb6281f SHA-256: a2fe2e54d1af968188549d701a604f700918373cb59efedb8f5115de22b6cb80
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/award?keyword=anteproyecto+codigo+civil+dominicano+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417426/normal_5fda90866428f.pdfIn PDF document text
    • http://devedilazabu.medianewsonline.com/brain_anatomy_diagram.pdfIn PDF document text
    • http://bijepitujutix.sportsontheweb.net/honda_gcv160_carburetor_parts_diagram.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376599/normal_606021b577fd5.pdfIn PDF document text
    • http://memiwuv.mygamesonline.org/kibexegefajiwikakusar.pdfIn PDF document text
    • http://wiboratiraveguw.mygamesonline.org/95705532627.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xufoziminep.onlinewebshop.net/1719452888.pdfIn PDF document text
    • http://zotubune.myartsonline.com/automatic_auto_transformer_starter.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/blocked_for_security_reasons_apk.pdfIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_879e657c9fa746d0ab74bcbeb2ea3ee0.pdf?index=trueIn PDF document text
    • https://e905a76e-7bc1-418c-be29-e8eda1603e86.filesusr.com/ugd/3fb32a_ed0dabc9c562409aa521ef6901c5cef2.pdf?index=trueIn PDF document text
    • http://pekomuvave.myartsonline.com/aldehydes_and_ketones_class_12_ncert.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/44327659463.pdfIn PDF document text
    • https://cfc603e6-7cd4-4c42-812b-9722deb80ae4.filesusr.com/ugd/0e9fc2_95fc29d322a2413b8ae112584a5d79ad.pdf?index=trueIn PDF document text
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_001d6ecac93b48a39099db13e1333f94.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tutasujal/manatotibe.pdfIn PDF document text
    • http://jatoxat.atwebpages.com/kenapanuwagefi.pdfIn PDF document text
    • https://61df3396-90b5-4b69-a3ae-475c9da6ebc5.filesusr.com/ugd/516574_9e1005a6290940acbe631a86806b4c9f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bagisi/burglar_eye_mask_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_off0000f868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF868 5448 bytes
SHA-256: 351a085b7989f50091f6cc6d61389a2f7ed5be103af3f8f2ce7110f9cd07134a
font_01_sfnt_off00010af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF2 10668 bytes
SHA-256: 87f38bfedaa46652d444bd409b9b972ecd24bb4241f578f081320b6f064e5874

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