Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e17d2f3636681ed…

MALICIOUS

PDF

81.4 KB Created: 2021-03-23 22:36:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e5a32304a0b4c87b6fdd5144d5c9a23b SHA-1: 7a28efd0e6f145d641f0778669b75a187751b749 SHA-256: 2e17d2f3636681ed522c01736582f25a97d43335620f4258922b42b76e676a0d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. The PDF contains numerous external URIs, with one specifically pointing to a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata related to 'calligraphy sheets for beginners pdf' and the authoring application 'wkhtmltopdf', likely serving as a lure.

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://bologen.ru/strik?utm_term=calligraphy+sheets+for+beginners+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370269/normal_6044a54753cf8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445129/normal_6058b5f4dcc6e.pdfIn PDF document text
    • https://cdn.sqhk.co/pizokifuxe/r0IUjhr/25748941891.pdfIn PDF document text
    • https://wufikasokuwomoz.weebly.com/uploads/1/3/4/3/134359410/2913516.pdfIn PDF document text
    • https://cdn.sqhk.co/jagakutojut/U9Dbflc/european_history_topics.pdfIn PDF document text
    • https://cdn.sqhk.co/xaveredero/cghgEgd/how_to_fill_cfa_scholarship_form.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/cihvhjl/2663591084.pdfIn PDF document text
    • https://cdn.sqhk.co/merabuvi/vjj4hiZ/pujuputavujisana.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426262/normal_604cbe270712a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413848/normal_6059e82153344.pdfIn PDF document text
    • https://bevikutemo.weebly.com/uploads/1/3/4/6/134648684/jonirewopiw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://naluboxanajuvog.rf.gd/majigamegiw.pdfIn PDF document text
    • http://gatokelemek.rf.gd/what_is_a_pre_employment_alcohol_test.pdfIn PDF document text
    • https://d6d3a1c5-32ce-46e9-ae92-c5b8d84d65d9.filesusr.com/ugd/a3b54b_6a81f3fcabde4ff193e53aa55c34d411.pdf?index=trueIn PDF document text
    • http://bakutogigu.rf.gd/55198114219.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/chinese_drama_series_with_english_subtitles.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/nipuki.pdfIn PDF document text
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_69415eb1cd9740ff8c39cb3d214a90f3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/add_text_to_photo_free_apk.pdfIn PDF document text
    • https://9e9203d9-9f5b-42f2-a849-05e42d741f90.filesusr.com/ugd/3527d5_506304c929dd42898e6cdc84da061b61.pdf?index=trueIn PDF document text
    • http://mekuletolazov.rf.gd/cobra_wedges_2020_review.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/aashiq_awara_full_movie_480p.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_off0000fe89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE89 5452 bytes
SHA-256: 47c5abdce6ca242360479999a1a4abeb5ecec21519c3da4566cd40c6ca717278
font_01_sfnt_off00011108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11108 11668 bytes
SHA-256: f2e7194ed619cd1c84a88b7ba6ff6cc65f512660d73d58b6c42cb0552628b663

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