Malicious PDF — malware analysis report

Static analysis result for SHA-256 849d3a9cb5b49fb9…

MALICIOUS

PDF

81.8 KB Created: 2021-04-20 21:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c8b02226f70253b7643236895c7db83e SHA-1: 8ec6db79b40f156a27c7045fb18fec4439b5d0dd SHA-256: 849d3a9cb5b49fb963e87fa0bf0c250948fc9523a4a27d9f988259b712b08df5
186 Risk Score

Malware Insights

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

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 0.9998

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://nipisod.ru/strik?utm_term=what+does+stability+control+do PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4463560/normal_5fd1555ad9b28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494893/normal_601bb8c188a3a.pdfIn PDF document text
    • https://mipijanifubu.weebly.com/uploads/1/3/0/7/130739658/1bd02a.pdfIn PDF document text
    • http://nizuloxodiza.iblogger.org/good_morning_image_shayari_ke_saath.pdfIn PDF document text
    • https://pezujotage.weebly.com/uploads/1/3/4/3/134318684/kewulug_dolazizebapuj_vununoj.pdfIn PDF document text
    • http://deduwewelu.iblogger.org/48106871781.pdfIn PDF document text
    • https://digaporabanezaf.weebly.com/uploads/1/3/4/6/134689005/viwizokir.pdfIn PDF document text
    • http://gomakugagazeg.iblogger.org/34586884454.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/6d6e48f4-57d8-4b4b-be28-992faa5a3b22/61672130275.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b506fb6-22ae-40fa-b672-18b3e3dc8d01/68188285292.pdfIn PDF document text
    • https://023e3b0e-89aa-4e00-bd19-175c11a0a9c0.filesusr.com/ugd/5f4883_cc12c686e4a846e3854e3d653a32bffe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f9a5597-acdf-4c92-9463-9e46189da8d1/10054071742.pdfIn PDF document text
    • https://1f2f8e77-98df-4c5e-b88a-83bc2b612b58.filesusr.com/ugd/5c7528_0a3590026de346299b7b9e802521b5a5.pdf?index=trueIn PDF document text
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_16ea25e5bf9f4a5f9ae63a2776c0f91d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e97653d-a540-416d-ace8-cf919a97c3dc/words_to_describe_something_rainbows.pdfIn PDF document text
    • https://46d16763-6c5f-4e19-aa2c-3f4071fcbec2.filesusr.com/ugd/26f730_04c3103ef36343868317b57d045709df.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9118f46-4f33-46a7-8764-b4cb24c13629/dutizabulodajosikupiti.pdfIn PDF document text
    • https://52f9d6e5-2fd5-4906-a030-4d12f703b62a.filesusr.com/ugd/297ecd_0e2033939c1140c7a5ba72b5821c768e.pdf?index=trueIn PDF document text
    • https://d9226533-59f4-4737-ae77-cfa9cdee5378.filesusr.com/ugd/d7c203_185154f519c34f88b3876f86b3668103.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF681 5280 bytes
SHA-256: baa6a712a083240fe90319d7570989ee7dc5a39b883ef2c0c22bb75514b629a0
font_01_sfnt_off00010877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10877 2408 bytes
SHA-256: 483abe818200e73b45cc388d7e78e7ff16b171eae8bc56ecc6913ead88eb84bc
font_02_sfnt_off000112f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F3 11272 bytes
SHA-256: dc39f0d6920c387d0cd0caea7bcaea68ef5b13b8b3d1502d287832aa062a22db