Malicious PDF — malware analysis report

Static analysis result for SHA-256 2223f221275113a3…

MALICIOUS

PDF

91.0 KB Created: 2021-05-24 16:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 579d5f65e04069f514e542bc10998f9e SHA-1: a607f2d3c8078108abd4280ddf78b8473ffc3fe2 SHA-256: 2223f221275113a3b31e8b703e04e3d7190bb825b39f2609cdab78dc76f916cf
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 to link farms designed to improve search engine rankings. The primary URL, https://resalured.ru/strik?utm_term=aprender+ingles+desde+cero+gratis+pdf, suggests a lure related to learning English. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=aprender+ingles+desde+cero+gratis+pdf PDF link annotation
    • https://patakobenidirok.weebly.com/uploads/1/3/0/7/130775678/muzarimik-wuvakupeki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450625/normal_5ffcfc1264371.pdfIn PDF document text
    • https://duwelebizan.weebly.com/uploads/1/3/4/7/134701088/ponidoje_dibiduwoliw_kufer_ribadibelij.pdfIn PDF document text
    • https://fikejibin.weebly.com/uploads/1/3/4/3/134331262/duterod-nofopisusejeme.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421474/normal_60419a53e898c.pdfIn PDF document text
    • https://xuniwinasifobip.weebly.com/uploads/1/3/5/3/135302293/zuxivilefoniruwezake.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418401/normal_6014c99693c8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485699/normal_5fd83e54519d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369174/normal_5ff7662c570d4.pdfIn PDF document text
    • https://waruzakelejabu.weebly.com/uploads/1/3/4/6/134600446/d63d2c69.pdfIn PDF document text
    • https://vejexuwelukilik.weebly.com/uploads/1/3/5/3/135340180/99cb80f819a5103.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/kovilowab/37930551273.pdfIn PDF document text
    • https://s3.amazonaws.com/lososimap/razumipokebuxisuboba.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/uptet_form_2019_sarkari_result.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/rikujadefipanutixutifagom.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/norixorubibe.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/6605686845.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/tabla_peridica_de_los_elementos_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/adanga_maru_movie_in_masstamilan.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/konosuba_light_novel_volume_16_chapter_5.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_off00010c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C40 5312 bytes
SHA-256: 4a75ae9eb6c8fecd4904b416942449518a1b7ce213bb56e05162603aaa9a826f
font_01_sfnt_off00011e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E68 12612 bytes
SHA-256: aff9b50e502302677857f30dc903483acb9933b3ca84e0275d0f537092c2eb45
font_02_sfnt_off00014777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14777 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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