Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a6f53ac7a822223…

MALICIOUS

PDF

74.2 KB Created: 2021-03-20 13:06:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ace065440921fbf0f5af42c60414b0ba SHA-1: 20d6f7cb0911156aae7e920def87957017b27b98 SHA-256: 8a6f53ac7a822223edd73f33f7e45366787bc1e5c94d79100a8d4b4895f7eb05
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it functions as a link farm designed to redirect users to potentially harmful sites, possibly for phishing or malware distribution. The embedded URLs and the PDF structure point towards an attempt to masquerade as a legitimate search result or document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://baarspo.ru/award?keyword=sembulingam+physiology+pdf+latest+edition PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4498971/normal_5feb0b2ee1033.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450907/normal_6052f4d554346.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474998/normal_600f57a777383.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393898/normal_6025f66a2109f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cc652f91-b1ab-470c-b36f-46d838ef85b2.filesusr.com/ugd/fbccce_277218b5897a44b4bd001059a2f36a21.pdf?index=trueIn PDF document text
    • http://wufagezigedo.onlinewebshop.net/23961843053.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/the_hobbit_book_original_cover.pdfIn PDF document text
    • https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_c83055d7dce641d6a48d1338d3b88d6c.pdf?index=trueIn PDF document text
    • https://48936d5e-4b15-4059-a328-ddb12afcc15e.filesusr.com/ugd/173145_dcd3906810754ebda310df32f49634e1.pdf?index=trueIn PDF document text
    • https://b962d5b8-8819-42e3-9ba3-d95e8366760e.filesusr.com/ugd/f51585_593b9a339f1249809df19fe5cecc6173.pdf?index=trueIn PDF document text
    • https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_889370a8dcbf46258e4f4a488ce2b40a.pdf?index=trueIn PDF document text
    • http://bufijonewufo.onlinewebshop.net/dabozazogasov.pdfIn PDF document text
    • https://314f4944-3dd9-45af-b5ee-fc7f46c963e4.filesusr.com/ugd/73cb9e_c27474d60b1647d9b4204f2faf926f37.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/senodiw/is_ram_dass_dead.pdfIn PDF document text
    • https://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_4de24dc938f846ca8af23cbe2d8cf368.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/zenonia_5_equipment_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/wixurisumaguzosanurifuda.pdfIn PDF document text
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_dd2eed4c78924145b8bd366b80d90103.pdf?index=trueIn PDF document text
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_9a870fd9416948a8aec03696ddd32c8b.pdf?index=trueIn PDF document text
    • http://zedofaxuboz.onlinewebshop.net/mavarubakum.pdfIn PDF document text
    • https://a146b927-ed54-472d-b3a8-6b137e313b92.filesusr.com/ugd/4d400c_6596f87e28d940e795ee264a30d44075.pdf?index=trueIn PDF document text
    • https://70010cfe-69b1-4fe9-a336-bdfe2418dc1e.filesusr.com/ugd/f1d680_7ef9cb60adec4c5d9c6fcc3786e133fa.pdf?index=trueIn PDF document text
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_d739b70a6556476d81a20469c1a83d33.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_off0000e3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D9 5704 bytes
SHA-256: 77cb279691cf7529563238146f69efdbf32b36521e5927663ab4998d1ddf208d
font_01_sfnt_off0000f71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71A 10628 bytes
SHA-256: 4e8d6f59c54e48448a16d2b962ed1ba312a12e81a306de22d316b53079fa24f7

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