Malicious PDF — malware analysis report

Static analysis result for SHA-256 0952bb47c65d44a1…

MALICIOUS

PDF

77.3 KB Created: 2021-05-28 16:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a51924a6a828677dd26582352c597faa SHA-1: b20b3d21dca4463819cfc7fcdfe1f4e1cf9e0ea9 SHA-256: 0952bb47c65d44a18f53fce44b0875eb1c4f332333dee8f6060eb11da7407850
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 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=unit+6+worksheet+3+physics+answers PDF link annotation
    • https://dedemapisiwopiv.weebly.com/uploads/1/3/0/7/130775251/medivezamo.pdfIn PDF document text
    • https://fozuxuvaporoj.weebly.com/uploads/1/3/1/8/131856883/ziwexadawazebar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372972/normal_606c4269a7717.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419235/normal_60011e8a43765.pdfIn PDF document text
    • https://bimufoju.weebly.com/uploads/1/3/4/3/134311804/jejatevelodisan_vanowajosomob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375083/normal_5fe7f6b382941.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415055/normal_5ffa997fafd23.pdfIn PDF document text
    • https://mipolokipum.weebly.com/uploads/1/3/5/3/135399848/xuzifarafiwumev-rojisumumeju.pdfIn PDF document text
    • https://zulujiporanaru.weebly.com/uploads/1/3/4/5/134590758/7363152.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465704/normal_5fcebd07b0dc4.pdfIn PDF document text
    • https://jopekaraxawil.weebly.com/uploads/1/3/4/5/134589640/zafufirapa.pdfIn PDF document text
    • https://sekugiwa.weebly.com/uploads/1/3/0/7/130739582/713913.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414335/normal_60140a2d21bb2.pdfIn PDF document text
    • https://zafewogi.weebly.com/uploads/1/3/1/4/131407253/xuserevif_vigixupetot.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/2c448d6c-16f2-4222-8156-1c4cd1980bef/la_verdadera_muerte_de_obito.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7b722c1-e64e-428d-b150-77df4bd1a54a/6483269649.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cf7b5b1-a35a-4667-8ba3-6b089dd25b1f/miller_welding_helmet_auto_darkening_lens_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3eaced91-5f5b-40c9-be68-d90f04cc61a0/how_to_knit_baby_booties_for_beginners_step_by_step_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d441ff1-5c4b-4afa-a107-5bdd16d8236d/xanathars_guide_to_everything_sorcerer_subclasses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c64c4eeb-0f4f-45bc-94fc-61867b8d2901/household_budget_template_excel_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5e401eb-a72a-4f4d-95a7-93a0bb098ab2/define_measurement_in_business_research_methods.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_off0000edc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC6 5556 bytes
SHA-256: 44554fb8fdee46ad03eeb4c2a1536b18cd623d70dac337f25ba4626bf3b81eb1
font_01_sfnt_off000100c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C3 11504 bytes
SHA-256: f9343d711068bf8d37dd16aaa176685b3c7d0838399886ba178d92e85d590865