Malicious PDF — malware analysis report

Static analysis result for SHA-256 c44b08c234ffbcf7…

MALICIOUS

PDF

73.1 KB Created: 2021-03-10 12:07:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 41b037e2fde5550ddc565b797d782eac SHA-1: 6f722e0bbb3293ddfe6e659c5706523c9bb13ce7 SHA-256: c44b08c234ffbcf734adc40799b04b0b2ebc7b664dbbb93a00171ec99d0dfe01
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with a significant number pointing to disposable hosting and link farms, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the PDF structure strongly suggest it's being used as a lure, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/wix?keyword=transport+in+plants+worksheet PDF link annotation
    • https://cdn.sqhk.co/tekunipifob/viiYhdP/dragon_buster_arcade_rom.pdfIn PDF document text
    • https://cdn.sqhk.co/fulaxanew/jhIjagc/learning_colors_worksheets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409619/normal_6046adf2e123a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502464/normal_5feff57f8d12d.pdfIn PDF document text
    • http://linavaluviriv.getenjoyment.net/malazan_book_of_the_fallen_release_order.pdfIn PDF document text
    • https://cdn.sqhk.co/gunumiku/djdjjbZ/cartoon_tv_videos_app.pdfIn PDF document text
    • http://manibupefif.mypressonline.com/69376800730.pdfIn PDF document text
    • https://cdn.sqhk.co/dagizonu/iPXiijd/stylish_fonts_keyboard_for_android_app_2020_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://validexa.epizy.com/how_to_do_a_literature_review_apa_style.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/8288896917.pdfIn PDF document text
    • https://c6506652-bf5e-4f52-be36-03dbfaede22c.filesusr.com/ugd/f74919_88e0e3742a8c497cb520133cfc8e2d23.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/kilamaserewamukageromek.pdfIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_09e218abc00d4e9a969bd96e0453d870.pdf?index=trueIn PDF document text
    • https://efed9c07-4553-4484-a419-1b844d271aeb.filesusr.com/ugd/6f475a_4ca88d27e80043e7b33329a0a5baddc8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zafibimutadoti/rent_large_format_film_camera.pdfIn PDF document text
    • https://ddd90330-5837-4e0c-b2f6-9383941cd2db.filesusr.com/ugd/568e2c_a665431b7ba849ad89b77727252af238.pdf?index=trueIn PDF document text
    • http://kujafugakare.epizy.com/miwidodezebarodedokub.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_off0000e30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30A 5012 bytes
SHA-256: 92aaa1d5986d18903d3b81282dccc002345fe928739bc0919a86251cea4a7fe9
font_01_sfnt_off0000f41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41F 10500 bytes
SHA-256: 78e74e3ba966a174bb5a867f7d2b36628f9171f7a4b890bf2838cf9b3288a6c3

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