Malicious PDF — malware analysis report

Static analysis result for SHA-256 54b768c9de6a011a…

MALICIOUS

PDF

66.5 KB Created: 2021-10-03 07:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 21ab1811e292632538972fa479717aed SHA-1: 7c1c9c2e4194d2fe152361696031f1b737acb579 SHA-256: 54b768c9de6a011ab5a491e51cb0f946af998250470970b5f119cd4adfb09a50
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF is identified as a malicious screenshot lure, designed to trick users into clicking a link. The document contains numerous links to algorithmically generated URLs hosted on disposable domains, indicating a phishing or malware distribution campaign. The ML classifier strongly flagged this PDF as malicious, supporting the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 66 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://drafthe.ru/uplcv?utm_term=all+about+chow+chow PDF link annotation
    • https://campermagazine.tv/public/file/xodafulapulumep.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/46800948166.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/43144520905.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/nededujajog.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/59588583705.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/45333134037.pdfIn PDF document text
    • http://stagticket.com/fck_upload/file/73967329068.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/nozosekuze.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/mafuluseri.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/midegi.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614708233a20a---sisegawitabujakiruwo.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/kepalemitezadunasataf.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/64275831393.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/31877482847.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/wolekunoniw.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/fumuxaziliwotu.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/95093317210.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/zegomewavajaxosifimotige.pdfIn PDF document text
    • http://tral-kerch.ru/userfiles/file/bivimadovumapivejerukoxe.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/a12cc16d1007523726305a5266c622e6/24887822013.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/gomogefu.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_off0000aa32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA32 10040 bytes
SHA-256: 088103405831a53247423bdacdb6c4ebd40b57a036adc67c7f5594ce1e410a40
font_01_sfnt_off0000c0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000d8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D8 14404 bytes
SHA-256: 0add4fd7e3253cb6062ca2ce5d04dfd9b6cd099ed50c250e00c2f09a58612cf5