Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf4c09da18108aea…

MALICIOUS

PDF

70.6 KB Created: 2021-03-06 07:08:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: aa0bd8a39e68c8d710d6792d51ceffce SHA-1: 16e9e4d2c3f39b1e5f02ab873ca587726e9689ce SHA-256: cf4c09da18108aeaa40373210c9fc303fc9478efd66cf0ac47658ec0bc2fd87f
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://seumenha.ru/123?utm_term=kenmore+80+series+washer+not+draining+completely PDF link annotation
    • https://cdn.sqhk.co/jegamaxegev/jjdiahi/27933658105.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410216/normal_603df4d397005.pdfIn PDF document text
    • http://aduo5.online/pelefosupugibizidjimer.pdfIn PDF document text
    • https://cdn.sqhk.co/mepetiruzi/QQm4vjd/86434687587.pdfIn PDF document text
    • http://rasprodavaika.ru/231409744883w54l.pdfIn PDF document text
    • https://cdn.sqhk.co/woxemumi/hdSjfPf/46319464977.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377928/normal_604189555fbf9.pdfIn PDF document text
    • http://reduslimitaly.website/via_hd_audio_6.0.11.1100_downloadinbyz.pdfIn PDF document text
    • http://frontglass.xyz/fixenadesrw16r.pdfIn PDF document text
    • https://cdn.sqhk.co/teposodigar/jaYjjhf/nitevekuporijuxip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445116/normal_5fe7ed93921e4.pdfIn PDF document text
    • http://tovelksa.website/lesizo7uf4c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476443/normal_5fcb716e7ecc1.pdfIn PDF document text
    • https://cdn.sqhk.co/juvowisire/jckjfgi/nogovobedajekifasuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://judowasejalux.rf.gd/chemistry_electrons_in_atoms_worksheet_answers.pdfIn PDF document text
    • http://pebuvow.rf.gd/invoice_form_template_html.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/6773246593.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/10th_std_english_book_2019.pdfIn PDF document text
    • http://jojixeme.rf.gd/58156520981.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_off0000d4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E0 5988 bytes
SHA-256: 259cb80353f68e3fe600b13d38b640198144e759b4d016fd5104026f3b2d6e52
font_01_sfnt_off0000e930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE930 10544 bytes
SHA-256: 2b418f7ddef06bc5f732425791785900abc8829c4c2b87238ec136ca0847f9b1

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