Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e37c19bed73b9d3…

MALICIOUS

PDF

77.4 KB Created: 2021-01-12 22:31:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a75459f3128ea030a8a811199585f603 SHA-1: 03c7714ddb5cb87a95896e8ab71d3bbbfe101fea SHA-256: 1e37c19bed73b9d362b10776f9c877060194a998f586e00b01b04fddb335e78e
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains an external URI pointing to 'traffking.ru', which is likely a phishing or malware distribution domain. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, further suggesting malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://traffking.ru/123?utm_term=how+long+does+valium+take+to+work+in+dogs PDF link annotation
    • https://site-1168030.mozfiles.com/files/1168030/zikelijavibosates.pdfIn PDF document text
    • https://site-1174930.mozfiles.com/files/1174930/storyart_apk_full_version.pdfIn PDF document text
    • https://site-1177116.mozfiles.com/files/1177116/la_redoute_france_contact.pdfIn PDF document text
    • https://vevorusafe.weebly.com/uploads/1/3/4/5/134516648/lewibisefipajoxisas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405895/normal_5faf5961d5bda.pdfIn PDF document text
    • https://site-1204796.mozfiles.com/files/1204796/xagelirilifekogamidizurep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374715/normal_5f8bf719c8166.pdfIn PDF document text
    • https://mujunoba.weebly.com/uploads/1/3/2/6/132682006/vejizasowuke.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kidugodofunose/servicios_de_internet.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/mexawug.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/jungle_2017_imdb_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/brother_printer_driver_software_free_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48B 5204 bytes
SHA-256: e2eb6630f418807a84a46bd6521c59ae74a3232c0475e3e6d134571c3e25bd06
font_01_sfnt_off0000f63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63C 10628 bytes
SHA-256: 26c21ef50a0c2e3e5140c17fcaaeb32e64b805b307f9d8e0e056aba7969ccd17
font_02_sfnt_off00011a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9D 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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