Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1394bbed6448596…

MALICIOUS

PDF

67.3 KB Created: 2020-11-26 23:51:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 81cbccdf88cfaa5961f1aa736bf85a38 SHA-1: d54c21c0b14b2af393339c557660e48c145f3fcc SHA-256: b1394bbed644859624fffd776895be5d80e014124f6378792ff2ddec0f56fc8c
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 0.9997

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://traffine.ru/strik?utm_term=power+pressure+cooker+xl+instruction+manual PDF link annotation
    • https://zitilegog.weebly.com/uploads/1/3/4/5/134501444/12cf63c6ceceb87.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/1fcf6d1d-5905-4b86-a53b-52f391973092/68326807575.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/banking_awareness_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/html_tags.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/rupometuxajug.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/jemitadenawuzepimajofunog.pdfIn PDF document text
    • https://s3.amazonaws.com/tiniruru/zokovazonuderasek.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/xunejavupe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a25ecd8-c5aa-47d1-a748-7644d2eceb7e/logic_gates_notes_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/wilson_bureaucracy.pdfIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/jadixefafedawa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60fc610d-d833-49e8-9cd5-dc6bdee435da/95425035270.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/litenowofusalinuwima.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_off0000cb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4F 5304 bytes
SHA-256: 74a3064541607dbdecf9378b88e18c995f3288675cf3e8c937ea97d44eb89af3
font_01_sfnt_off0000dd5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5B 10392 bytes
SHA-256: f642a41c66e6db0ba2bab07833f05ca07aac3e61c341e817b4df7f4bbcfd1cfb

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