Malicious PDF — malware analysis report

Static analysis result for SHA-256 661174cbcc986e0c…

MALICIOUS

PDF

70.0 KB Created: 2021-09-21 12:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f08ffca721548fc9a0b3fdc08f677910 SHA-1: 1128948b007a3ad2bde0c06848cbea7f01d5285e SHA-256: 661174cbcc986e0c3eedb89b9577c37b007177bddabd28d8cf2406c6fe836b02
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a social engineering attack aiming to trick users into downloading unwanted software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=download+subway+surfers+mod+apk+2020 PDF link annotation
    • https://perfectprojects.ro/userfiles/file/nijikutigodevexodusina.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/xugarewebejaxijesijis.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/82883535491.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/1c1757764a2a4d06111812439f601fb6/53296225041.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/51558161174.pdfIn PDF document text
    • http://silver1979.com/upload/file/domorarogizidigorapij.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210903043804170.pdfIn PDF document text
    • https://renault-service.com/userfiles/rizik.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-8/20210908045753211208.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/40397101535.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/24790548055.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/27060910863.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/63796340946.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109071759428956.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/74225950045.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/dosevemoxerane.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16134c85a4d7ea---ledosoxurigibagatobesuwik.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bagozozobafaxobilik.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/82198832266.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/97167594253.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/xipovebawakekazime.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/68552714592.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/11752457109.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_off0000b446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB446 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5D 11244 bytes
SHA-256: f2ef4bb4f95dcc318a13d3fa03651b93d161e65908ff742ce9f2f2132ee2ea34
font_02_sfnt_off0000e6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A4 14172 bytes
SHA-256: 8326009bde102f135ae77bc22fefbea7650b5e32747541c5be9ae17448f87fd8

Open this report in the interactive analyzer, or submit your own file for analysis.