Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb2fadec444d7df…

MALICIOUS

PDF

111.3 KB Created: 2021-03-29 04:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4aebdb34d161bc1779f679a9ec6e4df4 SHA-1: 54f7de0907f8a1105a6908f31716702dc8911b25 SHA-256: 4bb2fadec444d7dfa0630d1c254ce51eb846bbe26461ad7f1207d40c2f2b49c7
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lozipotod.ru/award?keyword=basel+standards+pdf PDF link annotation
    • https://cdn.sqhk.co/mowuseparap/YlgfieK/download_fatal_raid_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/nifijagik/kjf3Mqd/nesupo.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizufofuj/jbX6hg8/37102924897.pdfIn PDF document text
    • https://cdn.sqhk.co/jesupasuzoku/9f7y82y/adidas_nmd_white_and_black.pdfIn PDF document text
    • https://cdn.sqhk.co/jekunesoru/jghiLih/37669055624.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/tonisefoteka/kuzojifuzuruwatogobisilo.pdfIn PDF document text
    • https://9301df3d-c689-496c-811c-0581e5fecd74.filesusr.com/ugd/f62067_17e9b04cc2e649a086c17b556f1b75bb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/bijojovafukozulaven.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/how_to_read_a_book_chapter_summary.pdfIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_cd365fd6f3b344babc6584bd1bcb4d41.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/navedukasivab.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/93120924761.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/que_es_el_antrax.pdfIn PDF document text
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_ae5e8e1566934a9d84a96d5facfe4fa0.pdf?index=trueIn PDF document text
    • http://vutupaxuvidebif.rf.gd/66317785276.pdfIn PDF document text
    • https://f43304fd-85e4-489a-8612-81977e01be4a.filesusr.com/ugd/b6f504_26d75bbccd824b3ea82f69a4da4bd3b0.pdf?index=trueIn PDF document text
    • http://zosuvupetod.epizy.com/90372830757.pdfIn PDF document text
    • https://8ea4a4fb-2859-49e6-8c89-66ed49166bb4.filesusr.com/ugd/0088c1_d04c7dbb5ff043e28eb39e1117f53314.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/53425800940.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/xovotax.pdfIn PDF document text
    • http://wupepiwora.rf.gd/10849071344.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/28312562205.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B64 5084 bytes
SHA-256: 5664ed668bdef778d1d0f601322219a820e8ad0065e0afc6f5f1a4124d398f14
font_01_sfnt_off00016cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CBC 12344 bytes
SHA-256: 5ebf63835e8d3ca86c14f0b89c456b00876ea527b41f2e8a727733d192c38619
font_02_sfnt_off0001969d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1969D 17280 bytes
SHA-256: c68aa26a526e08e6f14d2b7ec33807e12edb4b8a2d17198e53306bdec1d92fec

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