Malicious PDF — malware analysis report

Static analysis result for SHA-256 23da120744ab8612…

MALICIOUS

PDF

62.3 KB Created: 2020-11-16 17:18:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 0b8675c3bcbce5c46e5bfb2e1aaef028 SHA-1: d3b1da0bf5be17c04d453f408b351f152482c6b6 SHA-256: 23da120744ab8612406df66d67400c999fbc7d61514b6dcbd2e8b223533101c6
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 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=seishun+buta+yarou+movie+reddit PDF link annotation
    • https://mefevujeloz.weebly.com/uploads/1/3/4/3/134317202/d6c255ac4c03.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/6d8f5c24-aef1-44d9-b5f0-ac6feeb8c1fa/18365523746.pdfIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/sewuxefozegafujusokixog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eab2a4e5-cdeb-46fd-88a5-dc987b592b7f/xuzititikogijomeba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5bc46e9-785b-4813-952a-4c65cfcb1cd3/pugulewevimelo.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/learning_javascript_design_patterns_download.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/gupugagilefutore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2340bcc5-f6c5-4235-a48b-c06d6e044323/31090952352.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be52cab2-91cf-45cd-a87e-78578270f423/peetahbread_roblox_avatar.pdfIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/vodafoka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/246f60b7-b143-4977-9916-d755ecabd338/32953636840.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fea8b90f-4df4-4041-8fa8-3fec2599b3a1/vufodejasiwapono.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_off0000b79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB79B 5436 bytes
SHA-256: 8af45f38f6d04c071a0080204744720270445375c0de46d3123a2eefb41400d6
font_01_sfnt_off0000c9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F5 10168 bytes
SHA-256: 7cee2121c0452a29dae7ffad5362dc256c048f6b63fe5edd31acc9254dda05b2

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