Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d66da752b1f4bf1…

MALICIOUS

PDF

99.3 KB Created: 2021-03-10 10:53:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1c82f7360fefb3f5ca32fb159134c9f9 SHA-1: 588113d99bc4f305d15a172de4f88ba36e7a88a4 SHA-256: 7d66da752b1f4bf184995369ecd7253dd12b1018ce2591ade19925d67d0073d8
186 Risk Score

Malware Insights

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

The sample is a PDF document that contains a large number of external links, many of which point to disposable hosting services. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs suggests an attempt to redirect users to malicious sites.

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://ponafet.ru/123?utm_term=dvt+treatment+guidelines+2017+chest PDF link annotation
    • http://3203epworthcres.com/compressor_de_free65kzr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407314/normal_5fe488aab37af.pdfIn PDF document text
    • https://kolofajek.weebly.com/uploads/1/3/0/9/130969684/a2f773d41fd1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372105/normal_5fe3d92c4a15f.pdfIn PDF document text
    • https://lebudikex.weebly.com/uploads/1/3/5/3/135310552/puzewajejonuje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384318/normal_60446b44a51f8.pdfIn PDF document text
    • http://tradestaroffice.com/88792927705ywkwt.pdfIn PDF document text
    • https://moluxoket.weebly.com/uploads/1/3/2/6/132682852/pokuxobeger_jefufukam_jidupefas_notep.pdfIn PDF document text
    • https://xuropowupenuba.weebly.com/uploads/1/3/0/8/130813979/4ea06ec.pdfIn PDF document text
    • https://lejujazu.weebly.com/uploads/1/3/5/3/135337057/de03f0b4.pdfIn PDF document text
    • https://lesesagipamagaz.weebly.com/uploads/1/3/0/7/130739561/folakiwuki.pdfIn PDF document text
    • https://vosuzupitozom.weebly.com/uploads/1/3/5/3/135313705/5456858.pdfIn PDF document text
    • http://goodsun.space/skyjack_scissor_lift_parts_manualhbrvh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473637/normal_5fcd53b99f90d.pdfIn PDF document text
    • http://medyayazilimtr.com/9th_class_ka_english_bookakjr7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413004/normal_5fc979182ef82.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/5218dbe7-3acb-4736-ac40-f15ccbdb1897/is_walking_dead_comics_finished.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14dd0db7-d793-47bf-9452-acfc2d683137/cuantos_tipos_de_sistemas_operativos_de_red_existen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3bf869d-5280-4d87-bc18-246882ee1a49/why_is_my_hp_printer_printing_blurry_text.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2ab5e10-554a-4847-a942-41e12470cd39/50369160481.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000130c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C7 5820 bytes
SHA-256: e3b3236a53edd50d858565e4c3194bdddbd9ff1b8a2526cb735530e71063c3e8
font_01_sfnt_off00014486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14486 11648 bytes
SHA-256: f7bc2d372a2963fdbbac12322c64940c7ae2163f81e92a66f411703594daaf62
font_02_sfnt_off00016b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B31 16028 bytes
SHA-256: 0bae8649ba252bcfab81cb8324cfe1737d73e47191b507e117e6d0858e0066a8