Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f9d2e37d21ff013…

MALICIOUS

PDF

70.5 KB Created: 2021-03-15 20:59:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b35eee9fe8b9d691af600251e9128fda SHA-1: 59c0a9952b3d495ce2f7f753e5706812a649ac14 SHA-256: 7f9d2e37d21ff013aecdebdb633a82fc1970433845554ebdde61515b9fa02832
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains multiple external URIs, including one hosted on disposable infrastructure, suggesting a link farm or phishing lure. The PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful websites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pelibifir.ru/award?keyword=balancing+chemical+equations+test+pdf PDF link annotation
    • http://bijavamu.iblogger.org/writing_letter_s_worksheets_for_kindergarten.pdfIn PDF document text
    • http://topfrag.rip/370590324947d4ys.pdfIn PDF document text
    • https://dupujemewo.weebly.com/uploads/1/3/4/0/134040979/bizuvupajekum.pdfIn PDF document text
    • https://rinulokol.weebly.com/uploads/1/3/4/8/134868038/kaguxuxalazida-xepos-jeramekuvanuje.pdfIn PDF document text
    • https://cdn.sqhk.co/gowozepugax/ijicTgd/canva_logo_maker_apk_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/vefapatape/gjc08hd/unblocked_games_balloon_tower_defense_4_hacked.pdfIn PDF document text
    • https://rorezumi.weebly.com/uploads/1/3/4/5/134591247/ferarexowize.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojiranat/Mehm6ie/56890513091.pdfIn PDF document text
    • http://grampus-shop.com/62828646051iv8r3.pdfIn PDF document text
    • http://hookup154.online/bwakila_na_mkude_audio59cod.pdfIn PDF document text
    • https://xijeruwenuvu.weebly.com/uploads/1/3/4/0/134018409/jisopu-datak-tujewaji-kizuwanobe.pdfIn PDF document text
    • http://moreronofi.iblogger.org/wow_cataclysm_prot_warrior_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/zikufivol/fKif3ih/destruction_derby_2_ps1_iso_download.pdfIn PDF document text
    • http://azorocheat1.xyz/margin_of_safety_seth_klarman_epub1blgg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://058da8ce-bb30-4b8c-81eb-8903018cac65.filesusr.com/ugd/ab745b_dd549c8df8314f3ba4b3045d5f350f2a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/07f038f9-1388-4970-b665-7a5eedcb2949/temogimu.pdfIn PDF document text
    • http://xujogefup.rf.gd/kurudajuvinanibeweti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09f90a95-bf2d-48fa-a070-6dd37d40a560/business_analytics_masters_salary.pdfIn PDF document text
    • http://tinosizifaxuful.epizy.com/59407898333.pdfIn PDF document text
    • https://0e627107-309b-4451-a84d-e7064c41fccd.filesusr.com/ugd/04c368_7be12df0317b44a9bddf10f267a0309d.pdf?index=trueIn PDF document text
    • http://zujetisapapido.rf.gd/arcgis_10_software_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39a631a1-b80e-4b43-8636-8ab1d9959646/if_my_thyroid_is_normal_why_am_i_so_tired.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c757b5f-9706-4860-bf39-e193de3abe21/interior_designer_jobs_mumbai.pdfIn PDF document text
    • https://33edd578-4186-4695-89f3-f56a5a23fc53.filesusr.com/ugd/f17c08_74e4252b035346d1ad840ef18377ae33.pdf?index=trueIn 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_off0000d35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35E 5648 bytes
SHA-256: 1d412e4141ae899a74c5c93eae042e591cffd8b987d2906af20e7d376b8cb1a1
font_01_sfnt_off0000e66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66E 11132 bytes
SHA-256: 8069f0f077d5ddea1c6cca17b3d199ca334fd91d7cde2a3d05152e9fb24824cb