Malicious PDF — malware analysis report

Static analysis result for SHA-256 745cc6ccea3ac909…

MALICIOUS

PDF

75.9 KB Created: 2021-03-29 13:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c107cb37f99ee9837d1b30d15a9b4d04 SHA-1: eea9f0d4a95cc4bed579920bb2441e4ac563a68c SHA-256: 745cc6ccea3ac909ce07537ae7bac44ad1fabe80f4707f0f1e0762ca2f17c773
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 0.9999

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://resalured.ru/award?keyword=%25C3%25A7al%25C4%25B1ku%25C5%259Fu+pdf+oku PDF link annotation
    • http://domavera.ru/maharashtra_police_bharti_question_paper_and_answera9yez.pdfIn PDF document text
    • https://joxisewegiwazev.weebly.com/uploads/1/3/4/6/134669132/sewojex.pdfIn PDF document text
    • https://nifubadipapa.weebly.com/uploads/1/3/4/3/134388301/jaburopasixugopimera.pdfIn PDF document text
    • http://testrun.ru/biology_lab_report_matriculation_experiment_1uru1a.pdfIn PDF document text
    • http://bufezipuduxev.mywebcommunity.org/76742683775.pdfIn PDF document text
    • https://cdn.sqhk.co/dasadogiso/jimtjcS/82495297728.pdfIn PDF document text
    • http://lavka-karamel.ru/fitasureyxkec.pdfIn PDF document text
    • http://clientesdkb.com/recent_allegations_in_smash_communitydovk9.pdfIn PDF document text
    • http://wolifote.getenjoyment.net/85960238739.pdfIn PDF document text
    • https://lupofavegevo.weebly.com/uploads/1/3/5/3/135335207/bae0807415ada.pdfIn PDF document text
    • https://gaxezoxo.weebly.com/uploads/1/3/0/7/130776828/vumojesefu_midam.pdfIn PDF document text
    • https://cdn.sqhk.co/tanusulirava/7ia0ggu/drifters_menu_smith_mountain_lake.pdfIn PDF document text
    • https://giliruba.weebly.com/uploads/1/3/1/4/131483170/turelukorim.pdfIn PDF document text
    • http://kutatit.getenjoyment.net/how_hard_is_it_to_set_up_a_wordpress_website.pdfIn PDF document text
    • https://cdn.sqhk.co/sufokorume/tNt17ib/tip_top_poultry_jobs.pdfIn PDF document text
    • http://giwapozolaleg.mypressonline.com/31559492100.pdfIn PDF document text
    • http://vanlit.ru/jotaledavugaxumufawapivamzv9y8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gujimosodaza.myartsonline.com/lakanuximomajonigoti.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_off0000eb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2C 5200 bytes
SHA-256: 95243826a650b270283a8c967b5b90b3e60e65b543a985a9707347ba7d97155d
font_01_sfnt_off0000fc7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7C 11836 bytes
SHA-256: f758bbd11a1507248c49e9735f1ccad732ff581c4fba72e489464dc25d4d0c4d