Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aa5f001c43555aa…

MALICIOUS

PDF

76.3 KB Created: 2021-09-19 11:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 82d417674c81d5320505f4ffb6d4f830 SHA-1: bf242dc7e9c4c19a94796dd813352718c1ca2feb SHA-256: 2aa5f001c43555aa93f2972b933671652b76182fc37d14a089c476b5e40cae3d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://irlanc.ru/uplcv?utm_term=shortcuts+app+apk PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0ce49b845---27301291653.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/vesakeselilevofu.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/81523349857.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/guzenes.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/19355582504.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/92422346164.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-11/20210911103222375820.pdfIn PDF document text
    • http://altinay-law.com/images/file/46461344983.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/suzokuz.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/28461037118.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/19310294161.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/70086571096.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/jolovolugumujodevidilot.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/luredepemu.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/19218998263.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/70825921611.pdfIn PDF document text
    • http://protok.pro/upload/files/ligesebilati.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/72641981274.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/sedezaxilakaxokotagulimut.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/fivolakas.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/vadelasunolifis.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_off0000c7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CF 17304 bytes
SHA-256: 85499d19d597d776a98673cb24779721e785f6f3dcbc3fa17e3cf1016be2d4a6
font_01_sfnt_off0000f46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46E 10364 bytes
SHA-256: 554525afb37725b6783fe4d6cb26688c8c21caef7271d3474bc0010dc64a6019
font_02_sfnt_off00010c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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