Malicious PDF — malware analysis report

Static analysis result for SHA-256 da33fb2429719483…

MALICIOUS

PDF

67.5 KB Created: 2021-09-25 21:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6468f9cdb42f0c204f3221956bca514b SHA-1: fd6623c92fbdfd861ee1b60b76a71a770905aacc SHA-256: da33fb2429719483a61b3e10934f00ef3b25e5589f0f6a6ce422475c509feada
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs and its classification as a link farm suggest it is designed to redirect users to various potentially harmful resources, including a specific Android application download. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but reinforcing the malicious nature through its structure and embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://coretry.ru/uplcv?utm_term=chhota+bheem+the+hero+apk PDF link annotation
    • http://bulk-supplies.com/userfiles/files/80586020270.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/34250283114.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/zoberinenuwadifufam.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/36733710438.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/didokusezabavomo.pdfIn PDF document text
    • http://hanauhrova.cz/files/mitewowovakedigivafux.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/39408662975.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/tafoxusupi.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c6edc6b98---54535294288.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/feneto.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/sugezilarivug.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/sakukabeko.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/vadakajovefulifegutugif.pdfIn PDF document text
    • http://hibertek.com/image/files/20210919_221908.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/vunima.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/tarivusebamipelemewutepi.pdfIn PDF document text
    • https://airbays.com/userfiles/file/zaletewomow.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a696a075e---jorezob.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/55420407848.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/69196505870.pdfIn PDF document text
    • http://groupkaishan.com/d/files/76866394290.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/xipuxoginob.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_off0000adba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CC 14448 bytes
SHA-256: 7ee244e03a39769ffde395b22304282515d0a2e1d2a8e97f56d134a6ad57d167
font_02_sfnt_off0000e97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97A 10368 bytes
SHA-256: c4f3d1e83cff35c711dfd422ff9652e1cc621c6e76db713e360f573666c0e56a

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