Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dee073abc6aae69…

MALICIOUS

PDF

69.3 KB Created: 2021-01-08 16:29:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: bcc1d246035818c3ee53681a45ea6f96 SHA-1: e4f91013eadfe5e66d1d312705f52a498b60eac6 SHA-256: 1dee073abc6aae697781ae7e8fa53c24dfd7d91cd54c1b0e04d8dd5cbc0fdd8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to PDF files, suggesting a link farm or a method to obscure malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate the document is designed to redirect users to potentially harmful sites, likely for phishing or malware distribution.

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://trafffe.ru/aws?utm_term=free+printable+one+step+equations+worksheet PDF link annotation
    • https://cdn.sqhk.co/gepeduvo/i3gcsjj/modepovutuluxapidufeba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367940/normal_5f89aab7c4afe.pdfIn PDF document text
    • https://cdn.sqhk.co/sugezigo/c9Eggjf/kolimepafoji.pdfIn PDF document text
    • https://misiwutikamiba.weebly.com/uploads/1/3/4/6/134601431/govegobipokumetoja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497688/normal_5fd3036522dbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426408/normal_5fa18bb2818a2.pdfIn PDF document text
    • https://cdn.sqhk.co/tevosenijosu/jg0ujdU/kirajavazorifakegabipo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414173/normal_5f9fa97fadea5.pdfIn PDF document text
    • https://metiledozixav.weebly.com/uploads/1/3/1/1/131164016/1164445.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/lokijuronig/senawumanemuvobuz.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/miseginoxubadax.pdfIn PDF document text
    • https://s3.amazonaws.com/kimone/68120156114.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/saga_delos_androides_19_y_20.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/rejetojimexune.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_off0000cfac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAC 5284 bytes
SHA-256: 891e78dbf0fea8120bc102fbf5db9bbd069e3c66a1ea2caea41d3fdcc2fd52dc
font_01_sfnt_off0000e1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AF 10696 bytes
SHA-256: 3ba035b355bbf3223b210ced6ca9af32dcec08646f95f1ffffb57a95a0dee088

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