Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91ce670fe8a7eb3…

MALICIOUS

PDF

76.0 KB Created: 2021-02-15 06:11:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b44513d3902833c19c46d140c6e0fd1a SHA-1: ec336dc481ab43d8d5ab6f66acb0d03adab024be SHA-256: f91ce670fe8a7eb3cdb6941dd361553871c6c083df3879939a4edee4c3a9846d
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://jottigo.ru/123?utm_term=calla+lilies+wedding+bouquet+ideas PDF link annotation
    • https://memetunariva.weebly.com/uploads/1/3/1/4/131454345/7862763.pdfIn PDF document text
    • https://wanezevidika.weebly.com/uploads/1/3/4/5/134588498/xirizewanatu-supepive.pdfIn PDF document text
    • https://mibirewisurux.weebly.com/uploads/1/3/5/3/135313447/xasog-tunuxi-tefodokutobe-lezolid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482847/normal_6008db8bc3545.pdfIn PDF document text
    • https://jawuvufos.weebly.com/uploads/1/3/4/8/134856807/wazaza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490961/normal_5fe76e32f1b54.pdfIn PDF document text
    • https://renobulog.weebly.com/uploads/1/3/4/4/134464004/vanijizep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475729/normal_5fcd35ae39eb1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478398/normal_5fc596411bf79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369316/normal_601d07a86d22f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378834/normal_5ffbddb862aad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417664/normal_5feb6b16470d2.pdfIn PDF document text
    • https://vojizozovogimum.weebly.com/uploads/1/3/0/7/130740342/fizuminafojos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415964/normal_5fcebf5065188.pdfIn PDF document text
    • https://fosobezi.weebly.com/uploads/1/3/4/8/134898374/xekuwip.pdfIn PDF document text
    • https://paweweribawu.weebly.com/uploads/1/3/4/6/134656346/4831662.pdfIn PDF document text
    • https://viwoposiruxeduz.weebly.com/uploads/1/3/4/6/134633276/majogifikibekazu.pdfIn PDF document text
    • https://cdn.sqhk.co/motulobugaji/ieMtNia/like_booster_app_for_tiktok.pdfIn PDF document text
    • https://serutoposax.weebly.com/uploads/1/3/5/3/135398922/kajuxemofidufiv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000eba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA0 5160 bytes
SHA-256: a46c4e8cf60639e755f3fbd843a036c573dc404e0c71efd895b11e4adb110ce8
font_01_sfnt_off0000fd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD41 11104 bytes
SHA-256: 9d5a684b9ad207046150395828f6d87764956f181739e6de3b48488537ff0175

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