Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b122d32622491af…

MALICIOUS

PDF

71.7 KB Created: 2021-03-13 13:45:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 6aae617dd4e53ee7a7cd705e0173c688 SHA-1: 44166f30ce3e07635646beba666664d2758af1f0 SHA-256: 4b122d32622491af56c727191059d6d3d161c5e9f507b07962d099d55d00dece
126 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that points to a domain associated with phishing and link farming. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URI suggest it's designed to redirect users to a potentially harmful external resource.

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://dugedepap.ru/award?keyword=joint+cdf+to+marginal+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375504/normal_6037ae578fcd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409840/normal_60386706e9914.pdfIn PDF document text
    • http://trujillostacoshop.com/what_is_the_cost_of_a_wow_computerxurmk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499984/normal_5feccff00c6b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500668/normal_603857daeb3b8.pdfIn PDF document text
    • http://about-igsupport.com/55022672023zfsfu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450878/normal_6020c1202e6e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448992/normal_604ca5bc1d71c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488558/normal_604c9caab100c.pdfIn PDF document text
    • http://kneeksi.ru/tuvum81jlt.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/dudujopixejikug/amharic_bible_commentary.pdfIn PDF document text
    • http://misovin.epizy.com/8_month_pregnancy_sonography_report.pdfIn PDF document text
    • http://zisekajoreva.epizy.com/79700906581.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/all_tags_and_attributes_of_html.pdfIn PDF document text
    • http://kalilom.epizy.com/bluestacks_4_offline_installer_32_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/bitdefender_box_2_manual.pdfIn PDF document text
    • http://zebusodevig.rf.gd/6402470520.pdfIn PDF document text
    • http://nuwumunis.epizy.com/bittorrent_android_location.pdfIn PDF document text
    • http://datadeb.epizy.com/alcatel_one_touch_evolve_5020t_firmware.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/zogakumarit.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/autodesk_recap_file_formats.pdfIn PDF document text
    • http://fodakobenolam.rf.gd/85287025705.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_off0000d94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94E 5284 bytes
SHA-256: 7d30db0d61c90a281c89e43ce96cea6036e4d93b51db675d9a3e2e16bb507375
font_01_sfnt_off0000eb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB35 11124 bytes
SHA-256: 8404fa6740386073cbe72a7ea16bdff8e89746547074da38772f30b35b2e54c3

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