Malicious PDF — malware analysis report

Static analysis result for SHA-256 226f4239cc9ffbcb…

MALICIOUS

PDF

72.4 KB Created: 2021-03-12 07:06:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 546f534639875675c41b6f27d6a72ae7 SHA-1: b102b8bfd1e62154763c41561ec95e7f5ffbc9f6 SHA-256: 226f4239cc9ffbcb816b6db4c9224fab29cf4a016f482425f343990e14cf7d03
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a ClamAV signature and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting it is part of a link farm or SEO manipulation scheme. One of the extracted URLs, https://golowaki.ru/award?keyword=e+banking+wikipedia+pdf, is particularly suspicious and likely leads to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://golowaki.ru/award?keyword=e+banking+wikipedia+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4491671/normal_5fc6b71e8fac2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480753/normal_5fd37ecedd901.pdfIn PDF document text
    • https://cdn.sqhk.co/jurugaguvedu/chh1Khg/police_motorbike_simulator_3d_mod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387408/normal_5fc8d52ed24a1.pdfIn PDF document text
    • http://noverst.xyz/segment_addition_postulate_coloring_activity_answer_keysig47.pdfIn PDF document text
    • https://cdn.sqhk.co/purorelaz/qge7yhg/lucky_block_mod_addons.pdfIn PDF document text
    • http://gratoram.site/jurassic_world_alive_cheatsf6slg.pdfIn PDF document text
    • https://cdn.sqhk.co/definuseju/ehbjcPD/minecraft_games_online_free_download.pdfIn PDF document text
    • https://nezikuwetop.weebly.com/uploads/1/3/5/3/135346993/fimibanutofazepiga.pdfIn PDF document text
    • https://zezazuzomej.weebly.com/uploads/1/3/1/0/131070861/jagujelinesiwe.pdfIn PDF document text
    • http://myirn.icu/bemesaviwaj6rd7g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489240/normal_6023c395d8a51.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/001ba950-5c9a-40ac-be47-063ae41d2c68/80781433397.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08c80078-c6a2-48d8-af77-d90450730e81/tevitapiturepixipaxunig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c10ea3a-28de-4fa9-a870-a25b558cd6dd/vevusefolojiziweresuk.pdfIn PDF document text
    • https://s3.amazonaws.com/taguxif/ap_psychology_exam_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/er_verb_conjugation_spanish_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca7dc16c-a449-4c24-b8a2-7318f8b956a2/online_project_management_training_certification.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/sibubevewot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c738c80d-5e9a-408f-a685-2afec180e694/5190186611.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_off0000ded1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED1 5156 bytes
SHA-256: 3b3f891ebcaf08c278e41ca62c606ad88257e5869fd4e8ca5e05fb06c8fe1113
font_01_sfnt_off0000f090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF090 10528 bytes
SHA-256: caf60265ab20909af61460a36d04caaaca3066f9261cbb89bf97726a14cc3c9a

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