Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa20e1b202cafc9f…

MALICIOUS

PDF

74.4 KB Created: 2021-09-27 00:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 506a90cb35591134f3f28d4d61051d47 SHA-1: e121e3067b8500dd33d496953e2a16b43075d016 SHA-256: aa20e1b202cafc9fcb75ad539877eaa884fd59d67d8decd522c40946ac553451
66 Risk Score

Malware Insights

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

The PDF document contains a high number of embedded URLs pointing to various domains, indicating a link farm or phishing attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs and a link farm heuristic further supports this assessment. No scripts were extracted, but the sheer volume of outbound links suggests an intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://smidgel.ru/uplcv?utm_term=android+x86+live+usb+persistent PDF link annotation
    • http://aal.tw/uploads/htmlupload/files/54028915444.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/jipolaguwivevosu.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/98579613981.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/sumurixogiluxetof.pdfIn PDF document text
    • https://merlak.ru/userfiles/file/vexebonarowuvutoderorava.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/95144110658.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/38922404611.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/84001616421.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/95000405904.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/68773743843.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/tabodobidixixek.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0b391a058---39462124360.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/99376022298.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/20219111759308959.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///boxofefewo.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/fukebiwajuxo.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/71036839367.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/8983808912.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614af00680721---kotirabozadowimuwaparip.pdfIn PDF document text
    • https://tessuno.com/upload/files/61481036df0e9.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/63305836938.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/55296052081.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_off0000b7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7DF 19308 bytes
SHA-256: a2181ab245f8b677cc967e2e375c850269b6f4952ba917ee31841278a295f3fc
font_01_sfnt_off0000e973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE973 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001018a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018A 10988 bytes
SHA-256: 8a90bf681a7df628702aeb41f19a636e3d12e3e7bf1c53158e6c05e534f1c99f

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