Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd709408952627c5…

MALICIOUS

PDF

73.0 KB Created: 2021-09-19 07:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 74e1ccd495615aad68aca7f740fc07c5 SHA-1: a1c9f7b3cbe261c785b3cdedb18379cb065d8346 SHA-256: cd709408952627c58773d4a846d325490bad41a8c14f023c9b6969289d898b76
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://takramaipai.com/mypicture/file/supedab.pdf In PDF document text
    • http://analhospital.net/file/files/gilosoduvujexajugumuval.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/6295401571.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/46985816467.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/moguvanodad.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/poxexa.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/levusunefuwoxedivavimove.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/35817840622.pdfIn PDF document text
    • https://jagominum.com/contents/files/fidirikozuwedakebo.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/34250283114.pdfIn PDF document text
    • https://stotex.rs/files/jijukunuzudozozedoxesap.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/25243736944.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/mezezevexoneteke.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///sanupumozu.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161418c65d5f47---23694010687.pdfIn PDF document text
    • http://arucax.am/user_images/file/lewaxusofepenofaw.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/zawisazozunozila.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/xesonunejerulamol.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/xorajativ.pdfIn PDF document text
    • http://groupkaishan.com/d/files/xajujapozugot.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/mogutobulevojezunorotuvob.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/64021134548.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=whack+your+boss+with+superpowers+apkPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB398 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAA 19236 bytes
SHA-256: d5cf1f6a89dc333059f90f6710e502260f6b673f5523465d1274c6dc346482d9
font_02_sfnt_off0000fd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7D 10848 bytes
SHA-256: a281bb816ad5bc70521f4b5530bea01868de63baca42f7b7a273dbf7abbfa5a2

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