Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a60e9b4a7b0e6b4…

MALICIOUS

PDF

77.5 KB Created: 2021-04-01 03:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 4f34e8786b9787f1fc8c2a0b0bf46d96 SHA-1: 353dbf9e815c5e978165644d1b4101757996db43 SHA-256: 8a60e9b4a7b0e6b4e3921e7ad6e85562aadd65e729fba1c4606d2bd6fb6fe962
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 are disguised as book search results, indicating a link farm or redirection to malicious sites. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the PDF structure suggest an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://maypoin.ru/award?keyword=intro+to+the+design+and+analysis+of+algorithms+levitin+pdf PDF link annotation
    • https://xudekumuf.weebly.com/uploads/1/3/2/6/132681038/d2ef133ae.pdfIn PDF document text
    • https://rivewatot.weebly.com/uploads/1/3/3/9/133999312/2801282.pdfIn PDF document text
    • https://xaxibilezulaf.weebly.com/uploads/1/3/4/0/134096047/jukazibu.pdfIn PDF document text
    • https://cdn.sqhk.co/zojixemem/aTNjh3b/facebook_messenger_edge_lighting_s20.pdfIn PDF document text
    • https://vozirelekoru.weebly.com/uploads/1/3/4/5/134594553/bewedu.pdfIn PDF document text
    • https://cdn.sqhk.co/talidapato/0HVhgGH/53588375310.pdfIn PDF document text
    • https://cdn.sqhk.co/didowolikex/ehbwDhe/xadenugalokarati.pdfIn PDF document text
    • https://cdn.sqhk.co/sobupepokor/hfhadgc/titimewo.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaxirupunu/icljjja/online_free_running_games_parkour.pdfIn PDF document text
    • https://xomuwesakutizid.weebly.com/uploads/1/3/5/3/135393414/tetizuropireseb-govegosi-lumodesozugaxok.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/mesixadelomomo/xibideb.pdfIn PDF document text
    • http://kulatamexa.epizy.com/how_to_fly_a_drone_for_beginners.pdfIn PDF document text
    • http://xalelafo.rf.gd/girufebapegud.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/10127429925.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/texofonajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7902b91a-561a-4bce-9b6a-ef455439aa9d/powemosezu.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/filajex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72f4b749-60b4-42c5-b685-4878e21e9d04/fufesegajepo.pdfIn PDF document text
    • https://s3.amazonaws.com/dazawojob/94119506538.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/66580475573.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/17286794281.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/40444670659.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e260cb2-c3df-4aea-a658-ebb03f5077c3/osha_approved_safety_glasses_with_bifocals.pdfIn PDF document text
    • http://bobamexexaru.rf.gd/31274819451.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_off0000f010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF010 5556 bytes
SHA-256: e18403e8ec0bc2ae6cd1d8db785585fb32563ab1565e31a4afbeb868dff1ce38
font_01_sfnt_off000102dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DC 10660 bytes
SHA-256: bb22cc5d9a83f726425a16d64c916058ac18f5483db4f7d78f84865a66874d21

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