Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d007f09a8e13be3…

MALICIOUS

PDF

77.0 KB Created: 2021-04-04 17:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c76d18e2d0a5a26694b1e15d3131b5fe SHA-1: 116eb5d7b8eb519fcf63a08fc4a42445fcc053a6 SHA-256: 9d007f09a8e13be391b0b4af70c70a675f38b5b48160b1f988bc2f4a56670cbb
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 0.9991

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://leonvi.ru/aws?utm_term=how+to+replace+ink+epson+xp+830 PDF link annotation
    • https://nejalebemenogun.weebly.com/uploads/1/3/1/0/131070187/d50c7a856dde409.pdfIn PDF document text
    • http://esportzmlevent.com/economics_today3A_the_micro_view1exn1.pdfIn PDF document text
    • http://govnososal.xyz/audio_trimmer_macrkmgt.pdfIn PDF document text
    • https://kibapeti.weebly.com/uploads/1/3/4/5/134515129/xeziniw.pdfIn PDF document text
    • http://comp-arenda.site/433251031660omcz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472783/normal_5fdcaca9cf87f.pdfIn PDF document text
    • https://lusanazuwade.weebly.com/uploads/1/3/4/0/134000197/7626248.pdfIn PDF document text
    • http://mokenolovulonom.medianewsonline.com/best_guitar_lesson_book.pdfIn PDF document text
    • http://nafigunagofadab.getenjoyment.net/cinderella_solution_main_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426060/normal_6047a1c7db3b3.pdfIn PDF document text
    • https://vaxinukosiju.weebly.com/uploads/1/3/4/6/134625250/d57cc0.pdfIn PDF document text
    • http://xukosususif.medianewsonline.com/biasing_techniques_of_transistor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368989/normal_60151fd7eea5a.pdfIn PDF document text
    • http://lebizifijafaxim.medianewsonline.com/wrist_blood_pressure_cuff_reviews.pdfIn PDF document text
    • https://xonutadeb.weebly.com/uploads/1/3/0/7/130775355/5212532.pdfIn PDF document text
    • http://pozezan.mygamesonline.org/26992388827.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426967/normal_5ff487379b3e1.pdfIn PDF document text
    • http://luchdobro.site/dbx_160sl_for_saleak3n9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lavisekenesavof.myartsonline.com/66423614884.pdfIn PDF document text
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_6b3639d91c864698b84339ae9beca1bd.pdf?index=trueIn PDF document text
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_de785756d9f84b2e9f7dd5bced7e582d.pdf?index=trueIn PDF document text
    • https://8c17aa34-c454-4d6c-a218-8929c845e329.filesusr.com/ugd/808cd0_76b2b2f4cfdf4c5baa19f97c26c01f2a.pdf?index=trueIn PDF document text
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_33fbe1a1bfa845038a5a9532a98e0699.pdf?index=trueIn PDF document text
    • http://godusisoti.onlinewebshop.net/brave_new_world_characters.pdfIn PDF document text
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_a42499ec44b84fc89b976d0ba22c2148.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_off0000ef5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5F 5612 bytes
SHA-256: 3a20f0da0a60c03a39a159763d351bdd5952f9d0ed44aa01ee286ffe4ba97859
font_01_sfnt_off0001028f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028F 10448 bytes
SHA-256: e59d0efc79b09f72e463fca23a7d00bff1538e027cbf38cfca55e279803a4186