Malicious PDF — malware analysis report

Static analysis result for SHA-256 57dae94def5e15cd…

MALICIOUS

PDF

70.0 KB Created: 2021-09-27 13:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 210768a1fc706517dc63dfeecaa0b232 SHA-1: bedb0f956d91425024948beac9230e8bd72ed8fb SHA-256: 57dae94def5e15cd75e6ad937be62e3e9d233220dd561049fd01959df44b2bf7
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF exhibits characteristics of a phishing lure, including being image-only with a click-outward action and a small file size. Heuristics indicate it functions as a link farm on disposable hosting, directing users to various PDF files hosted on different domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 70 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 http://palakkadtourism.in/ckfinder/userfiles/files/52634629178.pdf In PDF document text
    • https://newdesert.pl/userfiles/file/wugopodabekajesizezixu.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/kiganowasajajalinazexotis.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/72851072678.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/wudupujitoduzejuvufezov.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/xuxonixoxokaxad.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/9b140f18511f6b441090cebb2de30b73/rakemilujero.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/84005dd90bc464b93e8acbbba962daec/ninusopafo.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/68353306760.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/80773339031.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/32033109100.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/rotexuzasaputalen.pdfIn PDF document text
    • http://youil.org/userData/board/file/21398726631.pdfIn PDF document text
    • http://slsnn.ru/content/files/72185546492.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/82146191935.pdfIn PDF document text
    • https://cape-electronics.com/media/file/6861141086.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/duvereropavawoluwewo.pdfIn PDF document text
    • http://18554080.com/userfiles/file/60863239249.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/18085140476.pdfIn PDF document text
    • http://space-edge.com/upload/files/jivudo.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/61276137356.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/disetotaxugatefere.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/79766598048.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/61458284706.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/wujobesosawilanotigoxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=shadow+fight+2+level+52+max+mod+apk+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_off0000b343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB343 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5A 11352 bytes
SHA-256: 13499b02d7351913a357f527dc6100bf8befeb84c90e5d76f660dbbd8706f576
font_02_sfnt_off0000e5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D7 13700 bytes
SHA-256: 971f6c0d87df3e29be9821462df0d7a366ffd7de0dd0ee54455b4e140e0c6375