Malicious PDF — malware analysis report

Static analysis result for SHA-256 269763b48737e6c6…

MALICIOUS

PDF

86.4 KB Created: 2021-09-12 13:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 63779291727a2602d753b73d942a191e SHA-1: c3ca4f9f7d37effdca63c24d319a8a44d61f448f SHA-256: 269763b48737e6c61bdfcdb310307ea05bfc021e28545e071fb8b60ef0d89a5a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are embedded within the PDF structure and appear to be part of a link farm. The presence of these links and the heuristic indicating a 'link farm on disposable hosting' strongly suggests a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crysiq.ru/uplcv?utm_term=how+to+get+10k+followers+on+instagram+for+free PDF link annotation
    • http://msdoubrava.cz/foto/images/file/lajorugotavojawad.pdfIn PDF document text
    • https://rubfila.in/files/file/pafenonojikem.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/xawebitisimesota.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/20548408507.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/rezosikugu.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/tomojiwutidepadafanina.pdfIn PDF document text
    • http://wych123.com/upload/files/ritutokubozivepo.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/12899650828.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/dumetatilomikajixuv.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/78410601068.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210901060253_9g51to.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/fejonakobegaviwofaba.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/10404949863.pdfIn PDF document text
    • http://btfa.tw/upload/files/58989706573.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a620e1f46e---mirepijifilexuxog.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/72459891166.pdfIn PDF document text
    • https://webhosting4.net/media/file/lobagepuzugamugupevu.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/50939057829.pdfIn PDF document text
    • http://szjg.hu/images/file/68833248253.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/99501352101.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/wijejod.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/susavosexosivekawizome.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/16000809686.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_off0000ea2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2F 10900 bytes
SHA-256: 7e9f7c60d5f41b8f34ed6d88300441503f02889d24d123790df1a9457105413e
font_01_sfnt_off0001037e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B90 18488 bytes
SHA-256: fce6e8ade93f8305446b286fe3bd6a06debd7953d7c592cb66a31b33d2c733d8

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