Malicious PDF — malware analysis report

Static analysis result for SHA-256 459d0378d3621c69…

MALICIOUS

PDF

69.8 KB Created: 2021-02-11 21:44:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b52632cffa50de983c6457fed2897913 SHA-1: 8becc2df76169e830a7d538d1c302980dbaca3bc SHA-256: 459d0378d3621c693cd455b57ed1d60d235ecd714263b58870b86dfe0a2399f1
164 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_SEO_LINK_FARM, indicating it's part of a link farm designed to generate traffic or distribute malicious content. The embedded URL `https://maypoin.ru/wb?keyword=despacito%20tamil%20song%20%20masstamilan` suggests a lure to disguise the malicious intent. ClamAV detection and ML classification further confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maypoin.ru/wb?keyword=despacito%20tamil%20song%20%20masstamilan PDF link annotation
    • https://cdn.sqhk.co/perekowemo/rgZjbe3/colour_picker_chrome_extension.pdfIn PDF document text
    • https://cdn.sqhk.co/kawiwitifa/hihKThg/gatuvasilexurasa.pdfIn PDF document text
    • https://pixebekisutajud.weebly.com/uploads/1/3/0/7/130775176/c580bbb6ba4662.pdfIn PDF document text
    • https://zatenumidepav.weebly.com/uploads/1/3/0/7/130776458/wexokenev.pdfIn PDF document text
    • https://cdn.sqhk.co/jememobak/hzMhg4U/vet_costume_for_girl_diy.pdfIn PDF document text
    • https://cdn.sqhk.co/jirudumom/gqKtjiP/laxisopisivu.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/zafirawit/66493660867.pdfIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/25181885501.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/24865780534.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/siwozawipusubigi.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/66417391303.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/kikafezipinu.pdfIn PDF document text
    • https://s3.amazonaws.com/jujojomojemiz/abstract_reasoning_practice_test_1_answers.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_off0000d4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C9 5156 bytes
SHA-256: a3da66ed7e3138e058bb48faf9f3d30129e5b12471e8cf4ddf1f2886e569a8ef
font_01_sfnt_off0000e64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64A 10668 bytes
SHA-256: 0e42756f00f5c847a336d2c152c0f53b2d821fa895ebb0d971238ee186f4031d

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