Malicious PDF — malware analysis report

Static analysis result for SHA-256 21dd2ec0d0beafa9…

MALICIOUS

PDF

90.1 KB Created: 2021-09-21 00:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 72c292a59e4d1dc971fdbe74035d70b0 SHA-1: c98cbf7a6ee69b49f88aa2634bfff7d4abd7608b SHA-256: 21dd2ec0d0beafa918929adbbd6d3c99c81a778706c6b2752d3c92faf1eac129
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a strong intent to redirect users to potentially harmful sites. The PDF structure and the presence of numerous external URIs suggest it's designed to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://medvor.ru/uplcv?utm_term=gta+3+cheats+for+police PDF link annotation
    • https://sasalidayanisma.org/uploads/file/23306047738.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/kalamima.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/30602234313.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/sonowewajalewerameb.pdfIn PDF document text
    • http://quinta.cl/upload/files/92929875440.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/23486631013.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/7ca990a2aad34b90ad386a9961f9c20f/93799669677.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/88759649565.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/wefixegekojimirogixinimal.pdfIn PDF document text
    • http://meskerjager.nl/media/files/6549105987.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/84559910328.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/malijobegub.pdfIn PDF document text
    • https://riolisboa.com/images/ul_files/file/3sGRN9JExlmY.pdfIn PDF document text
    • http://mislenyiallatorvos.hu/userfiles/file/80685163645.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd1091e9b8---fodipuritaketo.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/78373913000.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/87942850150.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/fefatataro.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/gobukerutoro.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/xodudupugelarapu.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/lajesavunuwutopudemeg.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/vokimavuloruzugepe.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/95154399411.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/83036789027.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/47753929327.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_off0000fc20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC20 17936 bytes
SHA-256: e82fbb2e3a294423e497d73445eb27dd2c22a5f7d69a57f4c6cffb58fdb48203
font_01_sfnt_off00012a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A19 10684 bytes
SHA-256: b99167d56fac52356df09482e2c9a964761a27ad14c2618b4f75ee269e20bd56
font_02_sfnt_off000142cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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