Malicious PDF — malware analysis report

Static analysis result for SHA-256 729d77585db3bb11…

MALICIOUS

PDF

68.6 KB Created: 2021-09-10 05:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fbfea8479f0e9a2029a5bdfaad65f293 SHA-1: cca8c55addd28ac044eae01b4363f0839f3ff309 SHA-256: 729d77585db3bb114ed62c5fe272cd0865f0bf50d77e60e30223618be7fe9846
86 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical for phishing or malware distribution, containing numerous links to external sites. The ML classifier strongly indicates malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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 68 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://archism.ru/uplcv?utm_term=subway+surfers+offline+game+for+pc+free+download PDF link annotation
    • https://mihalex.by/files/files/jigurinu.pdfIn PDF document text
    • https://rubfila.in/files/file/37276942904.pdfIn PDF document text
    • https://anandalaya.in/resources/file/jejefuviduwom.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/kebomajufenufajajufipux.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132f560c1401---81840511244.pdfIn PDF document text
    • http://daiichihousing.net/uploads/news_file/80565516200.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/78881730286.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/wawepamavujegegunerik.pdfIn PDF document text
    • https://33mobility.net/uploads/files/lujaruvazafavedusopore.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/50337217490.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/39596539561.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/1018211603.pdfIn PDF document text
    • https://davaocarrental.com/images/file/1317003030.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/89661092277.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/79818051013.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/10582027641.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16137437f7451f---30836756271.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/47114716257.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/lerelanifexumej.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/widawitipegajubavogi.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/69354324581.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/zekujosapunepujejudaxiga.pdfIn PDF document text
    • https://alutat.com/data/file/vugokirelekejozeton.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_off0000aeff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEFF 14188 bytes
SHA-256: d663c839cf720e7a5c66f1e05b861ac8a6b46e66cf412c19458272007f40da0a
font_01_sfnt_off0000d20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA23 11380 bytes
SHA-256: af46faf8e0423f07e896daf895edbfc242169f6fd0e3738ef968eb925141b78b