Malicious PDF — malware analysis report

Static analysis result for SHA-256 8870072f647573aa…

MALICIOUS

PDF

62.7 KB Created: 2020-12-24 22:28:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4f962b1dcc738adf59a32f512e97114b SHA-1: bc9319ab308dee65d8a9a77769adc2864a60c10a SHA-256: 8870072f647573aa3b80897fc2926153064dce1fd3ca978de67028b33fc7e649
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://traffnew.ru/123?utm_term=women%2527s+petite+swing+coat PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387704/normal_5f96849e54e2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471688/normal_5fa711823dd59.pdfIn PDF document text
    • https://gebogunuwol.weebly.com/uploads/1/3/4/7/134732963/zefugalupizudape.pdfIn PDF document text
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/a9134212.pdfIn PDF document text
    • https://nunezujotegu.weebly.com/uploads/1/3/4/3/134312528/4770046.pdfIn PDF document text
    • https://zurowesijeja.weebly.com/uploads/1/3/4/6/134630916/vunarovojuse.pdfIn PDF document text
    • https://nibebelijatod.weebly.com/uploads/1/3/1/4/131452937/c5a6b199ae63.pdfIn PDF document text
    • https://texosubos.weebly.com/uploads/1/3/4/7/134715033/guburedadifejuwu.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/406ad56e-8f4a-4a74-b45d-fe0e20ed67d6/what_are_running_records_used_for.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/841baadd-af7f-48cd-8d60-3fa850df7e23/director_general_de_educacion_basica_en_el_estado_de_mexico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/515bd05f-eaef-4325-a5f1-b521c2482998/namalowefakumijisoxol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/155ae6b0-1f75-457e-9d53-24914d416b99/the_events_of_respiration_are.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_off0000b98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB98E 5264 bytes
SHA-256: 11b7c7d04966d06f57bb38d4867778875117dd4b8f6a51053c08b05a6393f8db
font_01_sfnt_off0000cb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8D 9688 bytes
SHA-256: 61dc812045a6975bc9ff0303b21d2627b83b9f35a940b915f14ae0905b3d18b1

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