Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3fc784e4a2446e5…

MALICIOUS

PDF

81.5 KB Created: 2021-03-12 07:43:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 72e8b73b18c806ea09588322b9a615da SHA-1: 5ddb9b156442e90e80ddfd3003e6bae9774812d5 SHA-256: b3fc784e4a2446e568a5581b29833dad048ffd24e82d2190ab4592b7b0d1f2ac
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://seumenha.ru/award?keyword=punctuation+exercises+for+grade+5+with+answers+pdf PDF link annotation
    • https://biligimanud.weebly.com/uploads/1/3/1/4/131454089/7410656.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421478/normal_5fc842545df02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485310/normal_5fe61893ac53c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420592/normal_6041d0afddbef.pdfIn PDF document text
    • https://tanuroxej.weebly.com/uploads/1/3/4/1/134131309/8e4ad899bf653a.pdfIn PDF document text
    • https://bumeguzi.weebly.com/uploads/1/3/5/3/135391430/e7bd7a9fb14.pdfIn PDF document text
    • https://xemiwiwoxotewa.weebly.com/uploads/1/3/5/3/135325065/rivirok.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/tipikaxe/50581055810.pdfIn PDF document text
    • https://adc67df4-9ac4-4169-8225-f8d60376216a.filesusr.com/ugd/a1c2c7_3837256e5e2a4598993b9674c65de541.pdf?index=trueIn PDF document text
    • https://3c45aaf8-24f3-4cde-9773-cf44a0a970d3.filesusr.com/ugd/ae7d54_fc0e72b4bed847f3898b32ca6d40d5f0.pdf?index=trueIn PDF document text
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_994a3e1efd954574828c3ba3ccd6916e.pdf?index=trueIn PDF document text
    • https://cd489911-dc6d-4439-b408-84622343fb93.filesusr.com/ugd/d8e941_2029ea86eb0a4dbc8a84236dc4aea827.pdf?index=trueIn PDF document text
    • https://ef733714-782c-48ea-8991-1bc0bf0c95f2.filesusr.com/ugd/ad2ade_2104e82b082246f1b2cad28d679a8893.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/72054705002.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/design_manual_barrier_free_access_2018.pdfIn PDF document text
    • https://8e8ef6ac-913c-489f-8395-c30730e7ba0a.filesusr.com/ugd/f39c52_9951b290cecb4bbcb2e99055956b1ee3.pdf?index=trueIn PDF document text
    • https://48bd7725-9370-4d18-884e-e75d7b70c9c4.filesusr.com/ugd/f241d9_a898ac8395804a44822622e6b83bcf9d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/jisaterakevavigu.pdfIn PDF document text
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_2a6de4fbacbd4c5d82e5d9f0d0acd666.pdf?index=trueIn PDF document text
    • https://c809e8a6-5bdf-489d-8d8c-df4e4638a115.filesusr.com/ugd/45a296_69752f460e2643319433fa7f0f93eea8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nemafu/98044615440.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/xokinuduxadeluvo.pdfIn PDF document text
    • https://s3.amazonaws.com/sogovekevi/facebook_for_java_nokia_5233.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/fuzerivogux.pdfIn PDF document text
    • https://af30af13-e0b7-4de0-aca7-7783c01eade2.filesusr.com/ugd/9757e7_74b72c3da5fe41e984a09bfd81f7ff0a.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_off0001012f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012F 5672 bytes
SHA-256: dfdafdce53430f781deb480aeac513af07a79591ed1266a93956a6bbad39649e
font_01_sfnt_off00011494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11494 10452 bytes
SHA-256: c46774ae22bb9be262aafc925f1c08284b32689d3e6f371736b3c99ada2f15e1

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