Malicious PDF — malware analysis report

Static analysis result for SHA-256 478a56d6f59f4311…

MALICIOUS

PDF

71.4 KB Created: 2021-05-18 14:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5fe007c775c26ba0d6d65c0b49ab3420 SHA-1: 707d9aa753f6ca0218139ddab076d81c51e5b963 SHA-256: 478a56d6f59f431192b94b4ac212f551dfde595f15a0e114bb4ef397290efd3a
156 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 0.9993

Heuristics 5

  • 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.
  • 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://jottigo.ru/strik?utm_term=figure+of+speech+worksheets+for+grade+5+pdf PDF link annotation
    • https://pojojozujivalim.weebly.com/uploads/1/3/1/1/131164399/kebodagidogalawuvo.pdfIn PDF document text
    • https://nanarazoru.weebly.com/uploads/1/3/4/8/134859944/gejomifaniw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426695/normal_5fcfad42275ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369330/normal_604b582d4baa0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369903/normal_6035a7435b4ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391315/normal_601b38d4f11f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404529/normal_602a415cbcab5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416927/normal_60317f85db51a.pdfIn PDF document text
    • https://baziwiruxufuwav.weebly.com/uploads/1/3/1/4/131482892/zavewabo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465006/normal_60669c4914a85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453144/normal_60535110cdf55.pdfIn PDF document text
    • https://motedozanegiraz.weebly.com/uploads/1/3/1/3/131383309/resotije-pegag-sazox-gatojerexez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/jinejewitodozozem.pdfIn PDF document text
    • https://s3.amazonaws.com/natewared/what_are_the_basic_principle_and_elements_of_web_design.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/wimazu.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/amharic_dictionary_java_app.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/solekanumej.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/tiwokuzisi.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/55771945531.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/49243410640.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/nizeg.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/lepebigipu.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/92642946531.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_off0000d742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD742 5620 bytes
SHA-256: cda933d561da86e934ed5845fff7de8b2b81e9fd59edd147a4f1836e5dc2df7f
font_01_sfnt_off0000ea81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA81 10472 bytes
SHA-256: ad437f33223565e93a1589d24e1b2e197e03b79c9bdfb42c861c07dccd6917fe

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