Malicious PDF — malware analysis report

Static analysis result for SHA-256 38f92824927311f8…

MALICIOUS

PDF

83.9 KB Created: 2021-01-11 03:45:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 9223e89f5168479f7c512b9a60f0413d SHA-1: bfed49a3e7604cc5078a7642fd962c0da2c674aa SHA-256: 38f92824927311f8adaa016ba7f88332d1c6d10224cb1fc754476e7f9c26692e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF that contains multiple embedded URLs, including one pointing to 'traffine.ru' with a UTM parameter suggesting a marketing or tracking purpose. Heuristics indicate it's a link farm on disposable hosting, and a machine learning classifier and ClamAV strongly flag it as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffine.ru/123?utm_term=beyond+positive+thinking+pdf PDF link annotation
    • https://vataripisak.weebly.com/uploads/1/3/4/6/134600115/3050112.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385038/normal_5fb6ca750b5d0.pdfIn PDF document text
    • https://site-1217081.mozfiles.com/files/1217081/dimensional_analysis_practice_2_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458144/normal_5fee958ecb734.pdfIn PDF document text
    • https://nefirekemoziwep.weebly.com/uploads/1/3/4/3/134332842/6466760.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383680/normal_5fa941a44d515.pdfIn PDF document text
    • https://site-1177129.mozfiles.com/files/1177129/badland_winch_2500_replacement_remote.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368235/normal_5f8b94830e25f.pdfIn PDF document text
    • https://mabosuvix.weebly.com/uploads/1/3/4/8/134851695/3316217.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/rekawexuretowo/bone_marrow_transplantation_journal_author_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/citizen_eco_drive_manual_h800.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE570 5028 bytes
SHA-256: 5dbe636dbf6fccdc626edcf8b912f4e5411fa06cc4da7c788acbdfa3ee79879a
font_01_sfnt_off0000f6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A1 11952 bytes
SHA-256: 99072acd612617e80467fb6e0002c9834ab95208551d52d75c940db9409ecb1a
font_02_sfnt_off00011f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F88 16076 bytes
SHA-256: e50652907db2bc45b4da017945b4afd03174f172933881ae60240a6447644d12
font_03_sfnt_off0001342a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1342A 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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