Malicious PDF — malware analysis report

Static analysis result for SHA-256 22333e9a8e555210…

MALICIOUS

PDF

68.8 KB Created: 2021-04-05 19:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: be54ad6abacfcbc0130f67eb31be8a18 SHA-1: 857c3882651493afd6f20d2bc90482c0d2dce0f9 SHA-256: 22333e9a8e555210254f13e8ff3bb494cfdbb20d76fecf232e9ea8575c1395fc
224 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of suspicious URLs and the overall structure suggest this PDF is designed to trick users into navigating to malicious sites, potentially for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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.
  • 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://yafferge.ru/award?keyword=clinical+biochemistry+practical+book+pdf In PDF document text
    • https://cdn.sqhk.co/rivotoxupow/eU7bqtD/73948250422.pdfIn PDF document text
    • http://lnstagram-support.live/boxuzelobimedonegetivev9d6p.pdfIn PDF document text
    • https://cdn.sqhk.co/wotezowedo/DKIheaA/nudapugajefobefevitoxe.pdfIn PDF document text
    • https://cdn.sqhk.co/sakupiraf/tSiaihA/k_yamet_kombat_arena_apk_2020.pdfIn PDF document text
    • http://vixegoxufareka.getenjoyment.net/cbse_improvement_exam_rules.pdfIn PDF document text
    • http://edarudost.online/un_viejo_que_leia_novelas_de_amorq2g2y.pdfIn PDF document text
    • http://dasezin.getenjoyment.net/jipewuzedi.pdfIn PDF document text
    • http://viewcreditscore.info/how_to_prepare_for_child_nursing_interviewvus60.pdfIn PDF document text
    • http://groby-ritual.online/rebel_without_a_crewehj07.pdfIn PDF document text
    • http://gokojun.scienceontheweb.net/83033099273.pdfIn PDF document text
    • https://cdn.sqhk.co/kimorotadopo/ihklJij/xcom_board_game_evolution_expansion.pdfIn PDF document text
    • http://vovpomnim.ru/howard_miller_clocks_repair8uxrq.pdfIn PDF document text
    • https://cdn.sqhk.co/guzowozuk/ieijcow/42659191637.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/5854d349-01c9-415f-87b2-f3182ebd6140/kaloxojezuvuro.pdfIn PDF document text
    • http://vimitafukufes.rf.gd/sedgewick_algorithms.pdfIn PDF document text
    • http://fuguzametekobo.myartsonline.com/picture_story_simple_past.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87c1c852-730d-46e0-8b2f-89cbad25a46b/weber_spirit_2_e310_assembly.pdfIn PDF document text
    • http://jifisuxevizek.myartsonline.com/kuzukozuvi.pdfIn PDF document text
    • http://gaxilitexu.onlinewebshop.net/wubodidolefanu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efa33674-3c16-4998-8513-14373d0e4c5d/generac_4000xl_parts_diagram.pdfIn PDF document text
    • http://letinolav.epizy.com/84392610176.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc2b9e20-5e09-4197-a684-3171d75c23aa/best_home_electric_meat_slicer.pdfIn PDF document text
    • http://nunavaxukozu.onlinewebshop.net/meray_pass_tum_ho_novel_download.pdfIn PDF document text
    • http://nisetekotixob.myartsonline.com/tricks_to_solve_quantitative_aptitude.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_off0000d13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13E 5608 bytes
SHA-256: 1b62cebff5a51fa01c54a05e5c3a669ec5fc52d670d2a3975871b962de0c84be
font_01_sfnt_off0000e421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE421 10044 bytes
SHA-256: 4885f39d4f262250e87cb7e675ac0baa08e5df7363386a981db3787e322b6f7a