Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdfddc684d62c804…

MALICIOUS

PDF

73.5 KB Created: 2021-04-07 23:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 40fafd211cae88a00f0e3d6489ff019d SHA-1: 5b83c8bcd3ff2457258dcb1255d425a3cfb03b1e SHA-256: cdfddc684d62c80411fbbd65c7a0e27cd2b7bee0051773b52f63d6cfd4f487dc
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://bologen.ru/123?utm_term=massachusetts+operator+crash+report+form PDF link annotation
    • https://gitapizi.weebly.com/uploads/1/3/2/6/132683136/samixolila-nasobofumow-mubomezuvifiwuf.pdfIn PDF document text
    • https://datugabow.weebly.com/uploads/1/3/4/7/134745554/5224123.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452392/normal_6048fc2e928e1.pdfIn PDF document text
    • https://kubazabuz.weebly.com/uploads/1/3/4/8/134885093/ziwoxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402737/normal_602d9874c8a6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387806/normal_5fdc7aad4a22d.pdfIn PDF document text
    • https://rebumazezip.weebly.com/uploads/1/3/4/8/134860465/8348035.pdfIn PDF document text
    • https://pizopivawot.weebly.com/uploads/1/3/5/3/135347149/gajalevosimokipepixa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gozamud.rf.gd/zuzufe.pdfIn PDF document text
    • http://nifekubipaxo.epizy.com/alcoholismo_en_jovenes.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/53780937046.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0925eac-af33-4e11-b5a3-79b8a6530168/english_speaking_colleges_in_puerto_rico.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/ejercicios_resueltos_del_libro_contabilidad_de_costos_juan_garcia_colin.pdfIn PDF document text
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_bbd440e9644b4d67a419eb8fee7c4acc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f42fd568-10bc-4797-9bcc-94590ae4b4b8/interior_design_courses_in_south_africa.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/cavatina_deer_hunter_guitar.pdfIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_684f4cab206544c9a99956f7a4368a0f.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_off0000e15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15D 5228 bytes
SHA-256: 96dd21b558e87ae08bb6f678b2db18302f32a2f2a7d7d31bf5a795e0dc2b8d5e
font_01_sfnt_off0000f30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30B 11028 bytes
SHA-256: e420c23a9934614c75b81df393bde4d18eb22cc0e3ff4915fa5fe1d9468a58fc

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