Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c7d2f284af92421…

MALICIOUS

PDF

87.1 KB Created: 2021-03-25 17:10:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f4e4eb96c7d4415e7ca557a1f0278df SHA-1: 57523f57a69cca704a0a7755deb5b4b0077bb90a SHA-256: 6c7d2f284af92421cfa9f58a94d6f86f7c0e3ff19527882746ec37e28e9f7803
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm pointing to 30 external PDFs. One of these links, http://greyfruit.space/694384922414gf3c.pdf, is likely a payload or further redirection. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/strik?utm_term=speed+queen+washing+machine+installation+manual
    • http://greyfruit.space/694384922414gf3c.pdf
    • http://ig-copyrightviolation.com/eureka_the_boss_superlite_model_402_filterrwdmb.pdf
    • https://cdn.sqhk.co/xaleteser/ieSGzAD/5175049077.pdf
    • https://cdn.sqhk.co/basinasedu/gYijhih/format_code_integer_python.pdf
    • https://cdn.sqhk.co/nixenexax/gfjejgd/punjabi_sad_love_ringtone_download_mp3.pdf
    • https://cdn.sqhk.co/lajawawinu/ijxzhee/tap_tap_fidget_app.pdf
    • https://cdn.sqhk.co/jimatoju/cEihFTU/lajakedofujelokepi.pdf
    • http://fherixq.com/lejidivojosazawekibobo73ex7.pdf
    • https://cdn.sqhk.co/xifinelire/ghjjaid/rumuxogij.pdf
    • https://cdn.sqhk.co/bekutojeke/igNlngd/tanuwikukejitezif.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8f0c9b82-9570-4081-bbb7-5e23a534ea09.filesusr.com/ugd/7008f3_d1ebb14427d44c89b64e811390e6ae56.pdf?index=true
    • https://s3.amazonaws.com/vobuturinivi/quartz_crystal_thickness_monitor.pdf
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_90fe0ab59f8c49b28c1de0668eff8ae4.pdf?index=true
    • https://bc732cde-fb09-4fee-8ab5-c82a45a1131b.filesusr.com/ugd/2ac701_dc48f0433c304b26899f2ba9f04052c2.pdf?index=true
    • https://676a7a22-5bec-432e-92e0-9d4a0a27851c.filesusr.com/ugd/a1fb72_5f590d38888744fb801462af7fd27444.pdf?index=true
    • https://510b81f6-be4e-4e40-9acf-3f60af495837.filesusr.com/ugd/5f226b_ceb5aff3a4c9446796cf6adbfe7a2f81.pdf?index=true
    • https://s3.amazonaws.com/sejakopa/serazixiwigom.pdf
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_14187d5da9b749bcb9dbdb7958c794d8.pdf?index=true
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100a9.bin
266dd8714a15060b89807989ba33a5d2e43089c038505c884c9b6092932838e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100A9 5712 bytes
font_01_sfnt_off00011404.bin
802a595b8d6aa1c209270d24530e9f018c528f4502a806ae0aa856177ebe4f4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11404 10840 bytes
font_02_sfnt_off00013905.bin
dbe1f6873dfbc63a557840fa26764ed1e24daf10180a919a5f50e881975b6f06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13905 16148 bytes

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