Malicious PDF — malware analysis report

Static analysis result for SHA-256 75cd1fb90b682a19…

MALICIOUS

PDF

67.8 KB Created: 2021-02-15 15:52:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 803a593d9924e6e0ea371140966bc037 SHA-1: a9c9eeb782cca19896e4fc9da1795f8666f8e7c7 SHA-256: 75cd1fb90b682a19e8f8ad7cba403f20540d232fc1a8dea8d7b1cd155f982e0f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a primary link pointing to a suspicious domain that appears to be part of a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and extensive external linking suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/wix?keyword=bioshock+infinite+burial+at+sea+episode+2+achievement+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4457330/normal_5ff5a8eae8be4.pdfIn PDF document text
    • https://lanasasaf.weebly.com/uploads/1/3/0/8/130815311/masidoxalojej.pdfIn PDF document text
    • https://dakilemuvepin.weebly.com/uploads/1/3/5/9/135963620/456f3ec01dd183.pdfIn PDF document text
    • http://dobanojuwelog.22web.org/layers_of_the_sun_coloring_worksheet.pdfIn PDF document text
    • https://lugijuvumefabi.weebly.com/uploads/1/3/4/7/134761930/18e647e1.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/selivuvumepaveb/20635593939.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/almost_a_hero_guide_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/zelosaw.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/88172744529.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/doctors_excuse_note_for_work_template.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/9092834577.pdfIn PDF document text
    • http://foperibonar.rf.gd/vezonixamazuze.pdfIn PDF document text
    • https://s3.amazonaws.com/ponivotigegepub/97343670348.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/mahavat_amnesty_scheme_2019_form.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/guidewire_policy_center_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/6500629110.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC017 3016 bytes
SHA-256: a57176794fb7a013e93cca151452ceab3ae41f145674f294752e3d0a0dd59424
font_01_sfnt_off0000cad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD2 6012 bytes
SHA-256: 802de8f3c99c2475bb3f6126a9e1ca21f7588e088fcc365daf883f1af18a3071
font_02_sfnt_off0000df28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF28 10052 bytes
SHA-256: ff7f51b9a4ac56b128191ac2a97cf9c000fab554611797950fe7de6a9794a36f

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