Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8e26c698844d82…

MALICIOUS

PDF

83.5 KB Created: 2021-09-15 22:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 56d1651245c745883ebd0414a77e0171 SHA-1: e864a400dc64dd763fd8eeb08fba9bdd2b2dd770 SHA-256: aa8e26c698844d82ce5cad0c03d94bc90e3a631765a87382f21738861da9dc4f
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attack pattern involving directing users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pfmconsulting.org/survey/userfiles/files/27468465881.pdf In PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/xaropopesetobovukibaz.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/terolonoz.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/23579200858.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9cc623693---67469468286.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/e083c51d8d1bdedb039c55f0b815d5fe/85294252908.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/pozopebemakijitiwemo.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/20040840444.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1630464882.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/pebuganunenorudokuwanut.pdfIn PDF document text
    • https://italvaping.com/file/faputaxejilekorokej.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/xoxowami.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/53069862811.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/jijetug.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/gisowodogerexegisesupi.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/45003019477.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/fezowivipujivi.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/natinu.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/sakik.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/43472549235.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+new+international+commentary+on+the+old+testament+pdfPDF 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_off0000ded6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6ED 11048 bytes
SHA-256: e27b008057d9f3eb6d61eb3bead876cf41b3853336a03abd6a3eae3b29da8d48
font_02_sfnt_off00011084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11084 18408 bytes
SHA-256: 743c590d0f245ba151f16bb85e911e93ba9ff514914a5a9b4c4ba4cd83e96cff

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