Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe7bd47254d4132…

MALICIOUS

PDF

81.1 KB Created: 2021-09-12 06:34:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 24b6a0a3b2dfc11984fd6ec941cb9042 SHA-1: bbdb93f82778eb7869d2251400c05ced07f7b776 SHA-256: 8fe7bd47254d4132490cc7842c24d3b9938ee937b3deba03dbf86958475d9075
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the presence of many external links suggests an attempt to redirect the user to potentially malicious websites, possibly for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 4

  • 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://wastran.ru/uplcv?utm_term=usb+tethering+from+android+to+mac PDF link annotation
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/witamimitoti.pdfIn PDF document text
    • http://djpress.pl/Image/files/76437357017.pdfIn PDF document text
    • http://djapm.com/userfiles/file/66530052632.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/zigutotavikireradajexew.pdfIn PDF document text
    • http://theponghop.com/upload/files/sipaw.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210902164926.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210903_5F71BEC5838EFF40.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/kawexopifewenafaxudi.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/tolorukijedepufasutob.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/damonisaxapenaxem.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/49875899530.pdfIn PDF document text
    • http://kaies.net/upfiles/2109110352065668142o05pz.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/4764695483.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161375175e1c86---5534329979.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/mitijadujukebi.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/30051141030.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/13949394913.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/84720616434.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/21406409133.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/kupamamif.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/70504959657.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/7791316797.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/28853184172.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/4175148607.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://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_off0000d4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E6 11024 bytes
SHA-256: 03eebbec16cb76c1cd7ee586503c59fb00486e494b9ffa9b8026a6f388cf863c
font_01_sfnt_off0000ee31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE31 18808 bytes
SHA-256: c14f118253ae1b244130f8f66a30319d9dcd3564a5869dc46c2c1486f83d6675
font_02_sfnt_off00011ed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1