Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb8525d1c9ddc3f4…

MALICIOUS

PDF

76.0 KB Created: 2021-05-29 10:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: f0c7ca32c49f0bd5a564ba251972b87a SHA-1: cfbf97683389316d174705c917dd7a23979f509e SHA-256: bb8525d1c9ddc3f4e5c3bf5d61f2f6879a41958b49cd20b2b556e3ded4bd53ae
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized, suggesting a link farm or phishing attempt. The primary malicious URL identified is 'https://crophysi.ru/123?utm_term=vaccine+schedule+texas+pdf', which is presented as a vaccine schedule. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://crophysi.ru/123?utm_term=vaccine+schedule+texas+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445103/normal_6046bdc84efea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496204/normal_604e6467a8672.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487916/normal_600495bfa86fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387711/normal_60473e5d29a20.pdfIn PDF document text
    • https://milonotupilo.weebly.com/uploads/1/3/5/3/135347339/dakarimagejibiju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472764/normal_604e099217380.pdfIn PDF document text
    • https://ledifufopore.weebly.com/uploads/1/3/4/5/134524185/ed8da35a.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/bd8d159b-980b-4363-8fd9-51567d57ad4e/fuperarijalef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e984958-4221-41a8-9e94-2e5a73c2f832/46133534036.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59fde10c-b5e7-4311-8727-1839bc171043/nasekozu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e4b9490-287c-4f6c-a547-27b21167deb2/eitim_psikolojisi_kpss_km_sorular_z.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3ffa38a-6182-4d49-a098-8898f1ce0d52/1715574560.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1ccafa1-b879-46ad-86e5-26e776e799af/how_to_reprogram_my_clicker_garage_door_opener.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3585ccf-649d-41f9-91e0-d13730789c3e/cogeco_ref_code_so200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f55c7a91-1282-493b-be58-e3bb2753cf96/can_you_cast_from_iphone_to_android_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1a34c9a-c4e5-4549-bd49-f9def1858a6d/paxuxafemidisidaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/301d800b-c95d-4243-a9f7-0fdc1d2c403d/98189866050.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_off0000ecff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFF 5180 bytes
SHA-256: 4ef5eb83173aa7b6a1fd78cf5f41c459196e1b054290c38cdb245f19a976e917
font_01_sfnt_off0000feab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAB 11128 bytes
SHA-256: 1f52164892162ee66dafb59d1fe41c26d214cb70dca327b63ef48db6efe4224f

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