Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a111bd958b81e78…

MALICIOUS

PDF

86.5 KB Created: 2021-09-16 16:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ea3e2b9b1275e40f096908e3c9ec3bee SHA-1: 0774af246400c1beb0f9edffe8b0fbcdac9f0e27 SHA-256: 2a111bd958b81e789920380430280be99c8b46f4f8a7909f1742553f98cf8989
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, a common tactic for phishing or distributing further malware. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://chcial.ru/uplcv?utm_term=fallout+shelter+online+hack PDF link annotation
    • http://cosmikkino.ru/sadm_files/kezimosutefu.pdfIn PDF document text
    • http://coumert.com/images/file/49333128612.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/78049290754.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/56884828588.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/defoxakijasedukipasum.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/69685290512.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/37435124552.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/18214583978.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/lububejuzuw.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/pinogumakepototefuful.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/kewapirorifaxamogidenedav.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/joximurup.pdfIn PDF document text
    • http://bergepkolcsonzo.hu/userfiles/file/vakowesenujefisusabaliv.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/77301264729.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/12911324266.pdfIn PDF document text
    • http://maconlux.lu/userfiles/files/mesijudipogobi.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffb9d7d8e3---sagub.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/45412523520.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/72139547701.pdfIn PDF document text
    • https://praktijkbinnenstad.nl/file/rakosuxiwawidigufamivak.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_off0000eab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C7 19312 bytes
SHA-256: bda9d740710dafcd3ebc314afb2879408a4613ff32094d74854a8b1bf69808d9
font_02_sfnt_off000134f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F6 10496 bytes
SHA-256: f0c58184b9bd7f2b869021c1377e0c27e9381ea14fcd8d2fb8915ec9a0e7eb79

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