Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e382e069c7036f9…

MALICIOUS

PDF

94.2 KB Created: 2021-09-11 23:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: afe4a1d971caf1c10d54436450ff6ab1 SHA-1: 5e543149a24ec923ee29e6dc267a2d56af19484d SHA-256: 0e382e069c7036f94af9c3e4067427d1f57893f4300ca3e1866024c50aeccc83
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm with numerous external URIs, many hosted on disposable domains. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and external links suggest an attempt to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/28407618457.pdf In PDF document text
    • http://kxqcgs.net/filespath/files/20210901221848.pdfIn PDF document text
    • https://e-room.co/userfiles/file/57376276776.pdfIn PDF document text
    • http://arablift.net/userfiles/file/70175530143.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/78366211040.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/f16343d9fe38c612b0655d0f0bad4d43/kavelovasepewoj.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/bitavunajogejileg.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/vopako.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/91964524311.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/67189279649.pdfIn PDF document text
    • http://dogwarts.ru/sites/default/files/file/vaborikawifufujubutosu.pdfIn PDF document text
    • https://keongracun.org/contents/files/34696807213.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/zejeboteli.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/74598256146.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/98046438889.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/56882884174.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/fewasuz.pdfIn macro / runtime command snippet
    • https://fajanav.com/aym_image/files/26818053132.pdfIn macro / runtime command snippet
    • http://solo-reisen.com/media/images/file/10876136546.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/49901527.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329f9f4f960---8775886243.pdfIn PDF document text
    • http://profstil.az/userfiles/file/devolopodonakukagiv.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/munuduvajuvekunut.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/20816589199.pdfIn PDF document text
    • https://osakaav.com/useIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=leones+contra+gacelas+pdfPDF link annotation
    • 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_off000106cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDD 19964 bytes
SHA-256: a17c4fe85536bf917728014f751eb3c6a7d1e6abaab8426920d9d459190c5fc6
font_02_sfnt_off000152a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152A7 10660 bytes
SHA-256: 8b4cbb1abd896036d3dd5411644ff3f8ca84bed26cf798dc2be3ac05367fc6b9