Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fa232776d6cec3b…

MALICIOUS

PDF

77.8 KB Created: 2021-04-20 10:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d9dfa10cc2295af1ada1a0b615847fd4 SHA-1: da0ce92b2f6eb305e4f756c3a1ba13f23078ca20 SHA-256: 4fa232776d6cec3be8495af84a7e59e667f589582ed1e2e2a99a31988c8d0b1f
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 0.9998

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://botokaw.ru/strik?utm_term=300+most+common+spanish+words+quizlet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4464083/normal_5ff04ac17a301.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369932/normal_5fef7c1ba320d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408177/normal_602364e5680eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419423/normal_5fc942bed178f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481408/normal_5ffa9b4b24f0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468812/normal_5fe9550f47efc.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/510475aa-6d9c-4fe2-a90f-a2609d42e3c7/rival_electric_food_slicer_model_1101e_4_parts.pdfIn PDF document text
    • https://f4b9ed98-44c1-44e6-9966-d9817cd43de7.filesusr.com/ugd/9ced5d_1074a323453b46d69358de566fcb94bd.pdf?index=trueIn PDF document text
    • http://zebofazedixa.rf.gd/90432680004.pdfIn PDF document text
    • http://fawituwiluke.epizy.com/albuterol_davis.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/format_actionscript_code.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/57915791468.pdfIn PDF document text
    • https://68fdcf0a-b1f0-4758-9edf-48d2be6d990b.filesusr.com/ugd/ac51ce_c81452c8c7b241b596a2648cbed635ec.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/789ab9ec-21e2-431f-b5a3-19bda4abb612/jubejapipapo.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/lakenuxoko.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/businajofav.pdfIn PDF document text
    • https://677f84e8-2a3b-482a-8721-58d714100356.filesusr.com/ugd/086aec_dbaa5e81ac2e4f86947e77a909b49364.pdf?index=trueIn PDF document text
    • https://7abbf572-6989-4614-8246-9d5ba34cd238.filesusr.com/ugd/af841b_218c34423ce849d79fb63333b4ba1ca4.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_off0000ecf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF4 5792 bytes
SHA-256: 5cb07b0a74f966df3e6b32fb875ddc51c59f9ba89094d56875dec2b1a5613573
font_01_sfnt_off00010097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10097 12024 bytes
SHA-256: 21551d68b8e7abb6fafc6fcd8c2fc128ed30ab0bc02b92f0140ddfa06a755d89

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