Malicious PDF — malware analysis report

Static analysis result for SHA-256 17a1f0f96e0b3288…

MALICIOUS

PDF

69.9 KB Created: 2021-03-01 05:43:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f4a7d37e6f32b29616393ba079b7af71 SHA-1: deeb5d156c553f851f31639c03a807f9605d55cf SHA-256: 17a1f0f96e0b328852d80ef10259bc76c7521955ee0519d6455675702688bcba
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/123?utm_term=logitech+wireless+gamepad+f710+mac PDF link annotation
    • http://dumubemajizukov.medianewsonline.com/fabuwepalisasun.pdfIn PDF document text
    • http://zisuroto.mygamesonline.org/how_to_open_midi_in_garageband.pdfIn PDF document text
    • http://lemixop.iblogger.org/now_or_never_mp3_download_dj_switch.pdfIn PDF document text
    • http://sunny-web.ru/mexeripifapirakupsctb.pdfIn PDF document text
    • http://zebatufiduku.22web.org/bissell_proheat_carpet_cleaner_operating_instructions.pdfIn PDF document text
    • http://rejemezurufoveg.mywebcommunity.org/tewutepisulubawib.pdfIn PDF document text
    • http://nuguzofa.iblogger.org/pekegekofilewujube.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jokipuzovorije.epizy.com/ivory_soap_between_sheets_leg_cramps.pdfIn PDF document text
    • http://duvovopuma.epizy.com/48898915825.pdfIn PDF document text
    • http://bukofitezude.rf.gd/chronicles_of_narnia_4_full_movie.pdfIn PDF document text
    • http://nokakegobowu.epizy.com/application_tracking_system.pdfIn PDF document text
    • http://kelukotezowopob.epizy.com/exclamations_in_english_exercises.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DF 5876 bytes
SHA-256: 711b71851dd9b5432573bc1aadc88795b515cd54ed622de135994aca479018f3
font_01_sfnt_off0000e7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E5 10336 bytes
SHA-256: 1ed76309b6647a82d1a1d364a52ff2d6e899c6ea0561a51743e4df75e32a20e4