Malicious PDF — malware analysis report

Static analysis result for SHA-256 22d0acfb65455410…

MALICIOUS

PDF

80.1 KB Created: 2021-09-11 06:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 496a0f1088e43f90fc9cafe641c982a3 SHA-1: ace13be370fdbbd11d5fea31f616e1ea591b39f2 SHA-256: 22d0acfb65455410895292f261d185b79906e0d41dd6b767d681a39d22630179
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains or link farms, indicating a malicious intent to redirect users. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure and embedded URLs suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://drafthe.ru/uplcv?utm_term=gfx+tool+for+asphalt+9+legends PDF link annotation
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326fc3a76b1---16114191833.pdfIn PDF document text
    • https://ancoraeducacion.com/images/60475903798.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/28008116974.pdfIn PDF document text
    • http://a-pluset.com/userfiles/desemafujuludirosak.pdfIn PDF document text
    • https://fond.ru/userfiles/file/95666635708.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/50024779622.pdfIn PDF document text
    • http://apismorava.eu/docs/xisofebabozab.pdfIn PDF document text
    • http://chieucoingason.vn/files/39322695603.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/rolikubapexexesa.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210909191527.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/munotej.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/4687830711.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/jorugifivet.pdfIn PDF document text
    • http://synergyproperty.com/images/files/74021536207.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/35790796120.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/zotavovugidivanak.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/lezarazunifixo.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/lanopidewepalatepinikuz.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/48314090895.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/75711871175.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/2741689829.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/pazigumiwuwumaralur.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210910_183538.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/5584348403.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_off0000c74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74E 10996 bytes
SHA-256: 2b795381ada756f060827497b8511d2e7b69a83c524aa002f69f1ecfe394a83c
font_01_sfnt_off0000e0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C4 21776 bytes
SHA-256: 69eadb0d518dbfeaa1b529f5eec247f1bfc708365e40fc15a7703c624c368c81