Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b4fd474f3f0af9…

MALICIOUS

PDF

80.1 KB Created: 2021-03-22 22:49:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 029760a4f13024a0be0fab289af37d7a SHA-1: a14ae3f332c48ea3e3f0f7d02b719f3f0fa38d4d SHA-256: d5b4fd474f3f0af98f51e5bdc5b31f9bd4668a4a807db1da4d5bd293a2f79359
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The primary malicious indicator is the presence of a large number of external links, forming a link farm, with the initial URL pointing to a site designed to mimic a search result for "pedigree worksheet answer key pdf". This suggests an attempt to redirect users to malicious content under the guise of providing a document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/wix?keyword=pedigree+worksheet+answer+key+pdf PDF link annotation
    • https://kasipuxatupar.weebly.com/uploads/1/3/5/9/135966953/6123513.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446034/normal_604fa74255b5b.pdfIn PDF document text
    • http://digosige.mywebcommunity.org/munatunetejipoxared.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495241/normal_6011d86d1ac1b.pdfIn PDF document text
    • https://ligonulijer.weebly.com/uploads/1/3/5/3/135318365/rakuzuse-gujurifetomimi-noxami-gekadejexu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453747/normal_60029bca88407.pdfIn PDF document text
    • https://fevuxutub.weebly.com/uploads/1/3/4/1/134131759/3a6cbb5c0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493545/normal_60287c24360ed.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/vuliwisuwig/92249883029.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/nusawagojupi.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/69531785753.pdfIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_156bc3fd1e514a90868223be8eb404b4.pdf?index=trueIn PDF document text
    • https://1527c8d3-3321-4e9f-872f-e2bebb57bac2.filesusr.com/ugd/bf2d42_f6f5744869b4477cbd4cc0d30ec6b420.pdf?index=trueIn PDF document text
    • http://xowobovu.myartsonline.com/best_kitchen_stand_mixer_2020.pdfIn PDF document text
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_628c0c3b3c4148edaa10ff1d28e5e39c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/molarity_problems_worksheet_answers_with_work.pdfIn PDF document text
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_23615e3841cd4bd3b1fdf3c4d4b4ef18.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_off0000fa0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0F 5528 bytes
SHA-256: 13798806518254e4b1f463204fc1842368799f770c5f2c3aa04115b7b570a3e7
font_01_sfnt_off00010cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF7 11488 bytes
SHA-256: b7d1c066634844b5d617b58b663bb70a153cc38fcfb7972002b38d0af5e06e9b

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