Malicious PDF — malware analysis report

Static analysis result for SHA-256 b28cd7d32d620626…

MALICIOUS

PDF

76.7 KB Created: 2021-03-16 10:17:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2103f6b736c40de559546470a1ada2a SHA-1: 5fc9a693fc1c0c78e3fbecba33b0d659133f42c0 SHA-256: b28cd7d32d620626b3bb1af98aa463eaccc67a90ad3ba32232579709702b5f7b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external links, suggesting a link farm or redirection mechanism to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to 'uno card game rules', likely to trick users into clicking the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/award?keyword=uno+card+game+rules+pdf
    • http://sarawavenudiwap.mygamesonline.org/basel_2_summary.pdf
    • https://ruxikikigiligex.weebly.com/uploads/1/3/4/3/134347308/wefugifuzafi.pdf
    • https://sirukume.weebly.com/uploads/1/3/0/8/130814715/3065857.pdf
    • https://lutowixo.weebly.com/uploads/1/3/4/7/134705225/fepazofuduzaw.pdf
    • https://bawoxuvebi.weebly.com/uploads/1/3/4/8/134886771/8156358.pdf
    • https://legotukalijev.weebly.com/uploads/1/3/1/3/131380351/88866f64c0d3.pdf
    • https://tekebuzegox.weebly.com/uploads/1/3/0/8/130814382/wazate-gobapupiromeror-jidirom.pdf
    • https://mexavabawidusa.weebly.com/uploads/1/3/4/3/134375000/3433717.pdf
    • http://siwupezomejen.getenjoyment.net/52216318993.pdf
    • https://zujamabosav.weebly.com/uploads/1/3/4/3/134363941/milefunejubito_tofazidowasiziv_jeropi.pdf
    • https://kiwiwutirove.weebly.com/uploads/1/3/4/7/134707888/7774699.pdf
    • http://tosefabebiribow.scienceontheweb.net/ethnic_conflict_examples.pdf
    • https://mivoxoxez.weebly.com/uploads/1/3/4/3/134340481/8d554c1bd0fb2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/patotale/dashboard_template_free.pdf
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_5b346c338f6a4116a2f5ae3f0eb5c1f6.pdf?index=true
    • http://matewedidoxeber.onlinewebshop.net/64041190947.pdf
    • https://a80c0318-1640-4d50-a016-df037fc402b9.filesusr.com/ugd/895bef_3307c716c7e1489197f8356e3b79e507.pdf?index=true
    • https://s3.amazonaws.com/zesixefe/281748407.pdf
    • https://s3.amazonaws.com/tobaziw/how_to_empty_ativa_shredder.pdf
    • https://s3.amazonaws.com/verirejon/asphalt_nitro_mod_revdl.pdf
    • https://s3.amazonaws.com/zewimu/wexukotiwodusabuk.pdf
    • https://03aaa7dd-6608-466c-a68c-f41c59811c05.filesusr.com/ugd/ae15ca_c902d81c35f0408ba53ad4e1d7de16f6.pdf?index=true
    • https://s3.amazonaws.com/zagapaxa/1692773739.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edd9.bin
02dedbd49259476cf752c21e03d8c5625d8c5ca60dae7c8fc4d979740ae0c4b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD9 5468 bytes
font_01_sfnt_off0001005f.bin
e45a43110b0f9f1200e79a06ce98bde890ab900ccca0c6c47c5d5a591eb52382		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1005F 10364 bytes

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