Malicious PDF — malware analysis report

Static analysis result for SHA-256 863ef393be8fd9e0…

MALICIOUS

PDF

67.4 KB Created: 2021-09-28 05:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 596958cd55422bb06be45355a2433a70 SHA-1: 9c51a99c10b6565f762f699ecc4a04034aa56f51 SHA-256: 863ef393be8fd9e0483d04501eb8d6b60b782d8b1100d4e6a901928244ec0026
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('pixomot.ru') that appears to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a pattern of hosting many links on disposable domains, suggesting an attempt to obscure the true malicious destination or distribute various payloads. No scripts were extracted, but the presence of multiple external URIs strongly suggests the document's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://pixomot.ru/uplcv?utm_term=rooter+game+app PDF link annotation
    • https://iqrainternationalschool.org/_assets/files/zotiwe.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/25711439191.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/fetive.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/zokazivafolurososuluw.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/65824656130.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/lomazo.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/bemelu.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/20355444009.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/guvawesojiruxabaxaluwo.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/xekataxusopevevimunanofil.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/jajelusujixozupu.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/ginaru.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/bubiv.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35704907430.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///zurebefevusedikenitekov.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/31321471338.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/88858217932.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/67415228732.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/wasurazisogusomejezidukaj.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/bofimelupufup.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/kogaxekaruxabezipepuvoso.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/68369144095.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/bajatatetoxorajilej.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_off0000acb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACB6 14644 bytes
SHA-256: c5183471d721695bb25b9a46623c55482053263fa295acf921fff116d01702b9
font_01_sfnt_off0000d13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13C 10228 bytes
SHA-256: 6c027a5d79489d3fb55db3b976ba269044541c4038ac84cd6ad64faecb0489ad
font_02_sfnt_off0000e845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE845 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1