Malicious PDF — malware analysis report

Static analysis result for SHA-256 f87d13242c163c35…

MALICIOUS

PDF

107.1 KB Created: 2021-04-01 23:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1cd6223c70c175a8185e8ae02f60e611 SHA-1: 51818b3024d36e9b8247e03a0c3d6d0fb957901e SHA-256: f87d13242c163c359544e12ec5ddddad7facf4b170d83e893d9adf068d4e38ad
156 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing or malware distribution lure, as indicated by the 'PDF_SEO_LINK_FARM' heuristic and the presence of numerous external URLs. The document body, though heavily obfuscated, suggests a deceptive title related to a dictionary. The ML classifier and ClamAV detection strongly support its malicious nature. The primary attack vector appears to be directing users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://resalured.ru/123?utm_term=dictionnaire+informatique+francais+arabe+pdf PDF link annotation
    • https://jizotigop.weebly.com/uploads/1/3/0/8/130874082/roburagol-dumaretivovej-kiwemebimapogis.pdfIn PDF document text
    • https://kopiwuzurori.weebly.com/uploads/1/3/1/3/131398237/gudarufevenoporopegu.pdfIn PDF document text
    • https://buwotudotep.weebly.com/uploads/1/3/1/6/131606539/4f2b3a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://92ddf5cc-4ce7-4caf-b117-8241c553a727.filesusr.com/ugd/42bae0_34b1103ca91146359e2a4a117af3fe0c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/voxulija/difiredafetajonutugebo.pdfIn PDF document text
    • https://0bdb67af-4c57-4a6e-9706-714cc80719f5.filesusr.com/ugd/fc840b_6af493743622453a908fafcb115e0b8c.pdf?index=trueIn PDF document text
    • https://0e9c393c-9feb-4465-ae9d-4486bea7a644.filesusr.com/ugd/4b68be_9f6973f44e7044269a98aa02e2504d0a.pdf?index=trueIn PDF document text
    • https://67536400-2f23-40e2-9d3a-36ae3f4dfb8c.filesusr.com/ugd/5312ea_af280296c9904fc7ab56b998e895aded.pdf?index=trueIn PDF document text
    • https://3d9856c9-ddaf-40ef-ab37-14107f3d3ee7.filesusr.com/ugd/938106_e3e2db84be764da5b31ff51cb0329ba4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wutogugej/datibipijaweji.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/carrier_30hxa_chiller_troubleshooting_manual.pdfIn PDF document text
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_70ed0b92454544e4962f4d0c0db92b22.pdf?index=trueIn PDF document text
    • https://336ddc11-c37d-4cd6-9685-7accad2975f7.filesusr.com/ugd/479fa9_642bc64eb0354c989cfc03e7d721f97d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/kutuzuwazonarudo.pdfIn PDF document text
    • https://ba3a7bb5-edd2-4228-b29c-cf272df6a868.filesusr.com/ugd/bd1c09_54102ad5c31b426da0734b56255a9806.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/citizen_skyhawk_limited_edition_review.pdfIn PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/33619500616.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/44802321669.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00015776.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15776 31888 bytes
SHA-256: 6cde4f674bc9c58feed873aaec7d284c2088b7812a9b068571cd4bb018db8903
font_00_sfnt_off00011eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB4 5416 bytes
SHA-256: 33db79838d9b9b51674207d20296bb3787f1c0b51fb13a93d95a356a1eeb8718
font_01_sfnt_off000130fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130FC 12036 bytes
SHA-256: 059bb9440db2fd77588ccaac4fbcb7f17497a4f4df7819b8c5aa1c4f9451ae8b
font_03_sfnt_off00018eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EAA 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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