Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6824016a2ff039a…

MALICIOUS

PDF

173.9 KB Created: 2021-01-12 07:02:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: dba3cb4713e0cad3ed8bcbb75b393234 SHA-1: ef68f29dd700116bcfa554e681c3a76e00a09f39 SHA-256: f6824016a2ff039ad3401f4a8aa3429e91fb2a77409129c77a7a0fe83ee23fab
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to 'trafftec.ru', suggesting it's part of a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9568

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://trafftec.ru/123?utm_term=krups+belgian+waffle+maker+walmart PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4452612/normal_5ff51f8a59ace.pdfIn PDF document text
    • https://tesegedoveveda.weebly.com/uploads/1/3/4/8/134891870/dixuteda-jazubo-legajok.pdfIn PDF document text
    • https://fikomepa.weebly.com/uploads/1/3/5/2/135299400/7d08929635f136.pdfIn PDF document text
    • https://fetavagipiw.weebly.com/uploads/1/3/1/3/131380759/3915705.pdfIn PDF document text
    • https://jarubobukifali.weebly.com/uploads/1/3/5/2/135297267/funuwokijet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420451/normal_5fa17ec075aed.pdfIn PDF document text
    • https://site-1172895.mozfiles.com/files/1172895/reaper_miniatures_dragonman.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/vazisi/90652271425.pdfIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/classes_python_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/50th_birthday_party_invitation_templates_free.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000241d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x241D2 3016 bytes
SHA-256: 07efd4b5ce35fe43d562a47bea6ca2be7e52a32f6dbf0d49a2a72276c44a66d1
font_01_sfnt_off00024c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24C8D 5256 bytes
SHA-256: c6aac2669a57e09052f4b289b8c40c37a3c3509ab8a59f105a1b72398d880eb9
font_02_sfnt_off00025e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25E63 11772 bytes
SHA-256: 665a87b3dfb20cfba5b8343b055a47a4a90ca5d215c0593cf0421b90054eadc2
font_03_sfnt_off00028655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28655 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073
font_04_sfnt_off00029b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29B1D 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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