Malicious PDF — malware analysis report

Static analysis result for SHA-256 19717e7acd382187…

MALICIOUS

PDF

78.8 KB Created: 2021-03-10 21:19:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 96b9ccdc86fa11b919dde33f95828268 SHA-1: 2d1b0348b7e74ca716b4f8fbb49c18c0116496e9 SHA-256: 19717e7acd382187644eb881056e57d252c3bb12d9280b9953d8d949e3f725ca
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 0.9992

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
  • 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://jacksth.ru/123?utm_term=asus+a456uf+driver PDF link annotation
    • https://ganupedudajoz.weebly.com/uploads/1/3/4/5/134586443/xopuwukejono.pdfIn PDF document text
    • https://jurulekoteg.weebly.com/uploads/1/3/4/7/134700509/089d403.pdfIn PDF document text
    • http://xiwesesakuvel.medianewsonline.com/78248755078.pdfIn PDF document text
    • http://joriwolujuf.sportsontheweb.net/94263221995.pdfIn PDF document text
    • https://nubeboganiroj.weebly.com/uploads/1/3/1/3/131384383/tuwiwupunun.pdfIn PDF document text
    • https://xopilujipuwoka.weebly.com/uploads/1/3/4/8/134886601/dibovexemokob-mobovopu-nazevinigaz-kinosetofami.pdfIn PDF document text
    • https://jipofaxinevafud.weebly.com/uploads/1/3/4/3/134350183/db348.pdfIn PDF document text
    • https://sudefenumub.weebly.com/uploads/1/3/5/9/135984534/wovupugifa.pdfIn PDF document text
    • http://mujododaziwato.scienceontheweb.net/fopamuginusugulidav.pdfIn PDF document text
    • https://takadoturig.weebly.com/uploads/1/3/4/1/134108809/tevag.pdfIn PDF document text
    • https://xonasuxodu.weebly.com/uploads/1/3/2/6/132681295/renole.pdfIn PDF document text
    • http://rufawefojag.sportsontheweb.net/topology_optimization_altair.pdfIn PDF document text
    • https://webonuru.weebly.com/uploads/1/3/1/4/131437172/7637412.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://010f2e21-25ca-4560-806d-08cbbb7c7db1.filesusr.com/ugd/74a852_b56cea7dbf404ec4816a5ba02e34ff07.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gedimuta/acronyms_quiz_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/bed_sheet_sale_singapore_2018.pdfIn PDF document text
    • https://e57d8632-f742-4524-ada6-9cdf759d9f13.filesusr.com/ugd/b0cb2d_db9cbef1ff864dcf98efb974e4c67791.pdf?index=trueIn PDF document text
    • https://ddb281da-11d2-423e-b83a-408ecf1f607f.filesusr.com/ugd/9db61c_a437ca031e394dc39ebfecc2231feff6.pdf?index=trueIn PDF document text
    • https://6f4861c6-cdf0-4a5f-ba2d-f9c5e5bfbee6.filesusr.com/ugd/77941b_a6cf0a6ad0bb4361b848774d645f7862.pdf?index=trueIn PDF document text
    • https://6c71f620-b6e5-46cc-9e58-526c5f0a7a41.filesusr.com/ugd/1c90dc_e2d54a8c066143fc8b9fe3171c0eef8a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fajixe/drug_biotransformation_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/tokyo_ghoul_re_call_to_exist_ps4_store.pdfIn PDF document text
    • https://8c17aa34-c454-4d6c-a218-8929c845e329.filesusr.com/ugd/808cd0_5a8f00206d524ae0b0165012eab7aa31.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_off0000f005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF005 5284 bytes
SHA-256: a139ad7cab51d894b58aafd1f23f377210642b86f0704e7fd6a1043b1f2774c2
font_01_sfnt_off00010226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10226 13576 bytes
SHA-256: 5be2c471c76f859965e8182542d5dddfd4ccd63906710f6fdb2637993ab69630