Malicious PDF — malware analysis report

Static analysis result for SHA-256 497a162539b34d86…

MALICIOUS

PDF

91.2 KB Created: 2021-09-12 20:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: ac82c37ac222063b214bc8e5eedb63f4 SHA-1: 91c9c9805cb96cedf4f306b6cfee023660229939 SHA-256: 497a162539b34d863b03dd8a788a6f59fb73eab37421cf6f3ec121df7df88fe9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URLs, with one specifically identified as part of a link farm on disposable hosting, suggesting a phishing or redirection scheme. The PDF structure and embedded URLs point towards an attempt to direct users to malicious external content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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=communication+between+service+and+activity PDF link annotation
    • http://meteosputnik.ru/userfiles/file/redodobedujikalox.pdfIn PDF document text
    • http://idcla.net/upload/files/47438711298.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/betepukafodefejomefa.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/30290505311.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/mowelusufifexiluvuradepi.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/84417212588.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/36749f641d552c5df4f6a385ec943934/64837072719.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2hfk3olrsr1ev962pgqefc3ps1/muriturebusu.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/wadodenotodekanunujuse.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/65510387717.pdfIn PDF document text
    • https://stormester.no/files/file/22438705163.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/lerugepifefopusin.pdfIn PDF document text
    • https://triosms.com/userfiles/file/70365628273.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-7/20210907071415304819.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/pinadofa.pdfIn PDF document text
    • http://giaphatmed.com/upload/file/72709788317.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/warawimorub.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/63629485668.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/73466183023.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/12778786413.pdfIn PDF document text
    • https://esperidiaogomes.com/userfiles/files/tekisezogo.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/wusijorag.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/negoboz.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/39073186249.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_off0000fc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC71 18624 bytes
SHA-256: 9d1900ce66d58b4c5b7027702f8f41a04d48a3fd3923e6f03f4470b77a2ec66c
font_01_sfnt_off00012cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144E8 11020 bytes
SHA-256: 8936f529a4e64869a55cc0efd2b7fd21b0650675257be67ed8d67f0d533cb52f

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