Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a340d81b594727…

MALICIOUS

PDF

106.4 KB Created: 2021-03-14 09:09:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b3fbba92f0d94fa1ee38cafac6fa7832 SHA-1: a6242d8b2d64670892fbc1d616e7c9fb12bfffe6 SHA-256: d8a340d81b59472793991d5c6b216ddd48ae5b2018dc2a6a28d257148c01bae1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing operation. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies the sample as a link farm on disposable hosting, reinforcing the phishing lure. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/award?keyword=canevas+de+redaction+d+un+projet+pdf PDF link annotation
    • http://rozefuzapotor.iblogger.org/kalman_filter_matlab_code.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419633/normal_6006df1e61f6d.pdfIn PDF document text
    • http://womenalikumat.22web.org/65625349852.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417309/normal_5fd2ccde28b59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452385/normal_5fdb80de37b19.pdfIn PDF document text
    • http://digitalcalakk1.xyz/define_adversaries_synonymyemdr.pdfIn PDF document text
    • http://opendouche.xyz/wofaripoxevidw1fz9.pdfIn PDF document text
    • http://fherixq.com/hmdx_jam_wireless_speaker_repairgushm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480889/normal_5ffe6c1468b17.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9504105-2e80-4296-ac0d-95ed9557e665/48919527674.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b70a641-a805-409d-82de-5f40dd928161/what_is_the_overall_theme_of_the_book_night.pdfIn PDF document text
    • http://resegubus.rf.gd/thule_roof_rack_installation_manual.pdfIn PDF document text
    • http://jokiperone.epizy.com/rubik_s_cube_guide_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b74349eb-5349-47ae-9026-6d3c7cb2fc80/97246183896.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/98496095396.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/takobumawoxuworor.pdfIn PDF document text
    • http://tulopagam.epizy.com/actualizar_firmware_router_d-link_dir-615.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/can_am_spyder_performance_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/81038243392.pdfIn PDF document text
    • http://nerokigonone.rf.gd/what_are_the_basic_interview_questions_in_sql.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/36791860377.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://scripts.sil.org/OFLIn 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_off00014711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14711 5160 bytes
SHA-256: 849d5ec2f4d7e2d35b97410036e8a3acbc721bbacaf9858c04a68f9220027011
font_01_sfnt_off000158b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158B9 14056 bytes
SHA-256: 8dcba650dd2cbacfefcd805c6b97cd269b294f0e5e57baaad82030c19d508b04
font_02_sfnt_off0001847d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1847D 16332 bytes
SHA-256: 603d18c6c4b740f5a30a8463ea9f8de543d837856d695fb0dbd8504a5e2050c8

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