Malicious PDF — malware analysis report

Static analysis result for SHA-256 51207fd8e194379d…

MALICIOUS

PDF

80.6 KB Created: 2021-04-23 18:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 7530988b278cebe85a48bbdf2fee2c34 SHA-1: 74b51c25a316e64802b2709bc19a9662d045966f SHA-256: 51207fd8e194379db791f0d52ccb454624e0a3bbbcdb7e73175c1094e52ea292
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites. No scripts were extracted, but the PDF structure itself is used to host and distribute these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/strik?utm_term=my+laptop+will+not+work+unless+plugged+in PDF link annotation
    • https://mikuloxituxawe.weebly.com/uploads/1/3/1/4/131410747/4879937.pdfIn PDF document text
    • https://bunexomuxupekir.weebly.com/uploads/1/3/5/3/135316193/gobekaterazig_sanatusisewabil_vupenenub.pdfIn PDF document text
    • https://sofamilases.weebly.com/uploads/1/3/5/4/135401016/17697c41d44.pdfIn PDF document text
    • https://gorejorifal.weebly.com/uploads/1/3/4/8/134888975/1216259.pdfIn PDF document text
    • https://wuginimujewege.weebly.com/uploads/1/3/4/7/134714977/a881126.pdfIn PDF document text
    • http://gakawisogafuga.mygamesonline.org/27235708596.pdfIn PDF document text
    • https://cdn.sqhk.co/korulifesewa/wAigVge/disney_princess_dress_up_shoe_selection_box.pdfIn PDF document text
    • https://fusikejasuk.weebly.com/uploads/1/3/0/8/130874124/341e325.pdfIn PDF document text
    • https://cdn.sqhk.co/tipusuzog/fB1HDNl/60466989670.pdfIn PDF document text
    • https://cdn.sqhk.co/pinepopowig/bhjjejf/analyse_abc.pdfIn PDF document text
    • http://miromawetibikew.mywebcommunity.org/suvudewivakaxuxoradedetuv.pdfIn PDF document text
    • http://bisituz.sportsontheweb.net/buckling_of_columns_theory.pdfIn PDF document text
    • https://cdn.sqhk.co/fanasuzajem/IiaMZha/mepuwopaxaxanuwesi.pdfIn PDF document text
    • https://cdn.sqhk.co/xitilesuxiw/cD9BUbI/bedwars_map_download_mcpedl.pdfIn PDF document text
    • https://rifubagozoj.weebly.com/uploads/1/3/2/6/132695416/5753728.pdfIn PDF document text
    • https://luxufaxunixepu.weebly.com/uploads/1/3/4/5/134584211/6493199.pdfIn PDF document text
    • http://wixosefimaba.scienceontheweb.net/87740981134.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bidajalej.onlinewebshop.net/40596999851.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b977eb1f-019e-456d-8784-9287cf60d1c6/kiwelowujubozogunax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29e2ef4a-59f5-4ce8-8ffe-ab6e29408d63/how_to_pair_kohler_shower_speaker.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_off0000fe17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE17 5392 bytes
SHA-256: 2ea1f5f5e8fbc3ad8a8aa396fdaec85973e885cc66101c590aaa2266adedbe25
font_01_sfnt_off0001109f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109F 10524 bytes
SHA-256: c0b7f052d2067864ba8dc0f743dcf3a30d604d93459b1340f8220411833ceccc

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