Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae0517122a72a96d…

MALICIOUS

PDF

70.4 KB Created: 2021-10-02 10:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 50084fcef66835382e7d2a81909e3118 SHA-1: 34ebdcc60f81a2f250b0d68c87b0095bf902308f SHA-256: ae0517122a72a96d3f65324009373bc66cf2ced66c9c77adeca38f9d17e903ff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to PDF files hosted on disposable domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://laarakkers.com/ckfinder/userfiles/files/36653881867.pdf In PDF document text
    • http://zovsh.com/Uploadfiles/files/magomidikepijoradenepazab.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/tibubolazafazup.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/26581662026.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-12/20210912175150739064.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/67341164838.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/16956858636.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/46179799332.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/xunatidafavasikofoxab.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/jobusafomibebitozuvo.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20211002064852.pdfIn PDF document text
    • http://saint-party.com/media/file/muwaw.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/rutobine.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/vaveludixusokow.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/kevafuvomaxem.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-6/20210906055107757264.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/tolosijivemaxikotu.pdfIn PDF document text
    • http://termocity.by/pics/files/bobotu.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/34618008619.pdfIn PDF document text
    • https://upaspor.com/resimler/files/30606280740.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/nanalozabafagi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=let+us+c+pdf+15th+edition+free+downloadPDF 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_off0000af10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC722 16968 bytes
SHA-256: 7b25e96160d0c17d83b39a6d0e8a5875491c9bf92e923a623847d876c1dd3106
font_02_sfnt_off0000f1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EE 11044 bytes
SHA-256: a8c8a6c98e488e79b784e0b9c93f6ca951ef219fd0fe230cb6da46a0054316fe

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