Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0b880b60bd4b7cb…

MALICIOUS

PDF

68.7 KB Created: 2021-02-25 09:12:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 95f083e048fb11528dd3c520a1b88c89 SHA-1: e46e5dd629128c2ab7dbbe29b3437772f218f152 SHA-256: f0b880b60bd4b7cbe8e2ff787a89981707297a931a8872cc4b4a68fd5ccd78d7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to mimic search results, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The primary URL 'https://jacksth.ru/strik?utm_term=toshiba+canvio+slim+ii+not+recognized' suggests a lure related to product recognition issues. ClamAV and ML classifiers strongly indicate maliciousness, classifying it as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=toshiba+canvio+slim+ii+not+recognized PDF link annotation
    • https://cdn.sqhk.co/kimejijomaki/fNjeGS4/playstation_network_sign_in.pdfIn PDF document text
    • https://cdn.sqhk.co/lesasafo/j3MheTN/dosekekex.pdfIn PDF document text
    • http://forovasax.medianewsonline.com/32809843651.pdfIn PDF document text
    • https://cdn.sqhk.co/rivotoxupow/XAiaJie/58294190837.pdfIn PDF document text
    • https://cdn.sqhk.co/pefatipi/7iaicq7/radenog.pdfIn PDF document text
    • https://cdn.sqhk.co/moxinivo/ghiaUkY/vinonuk.pdfIn PDF document text
    • https://cdn.sqhk.co/vituxezij/ggxAOvB/37113664288.pdfIn PDF document text
    • https://giboritozi.weebly.com/uploads/1/3/1/3/131379296/detugokazodenife.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuxopova/c1iWyGy/63219007059.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/aqLnyjh/73147781648.pdfIn PDF document text
    • https://cdn.sqhk.co/wujejelot/jgeIogd/mens_haircuts_longer_on_top.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://s3.amazonaws.com/rexogeguxosix/biography_outline_template.pdfIn PDF document text
    • http://jezevenakos.myartsonline.com/27183862744.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/mokaluliwanorabigaxiwe.pdfIn PDF document text
    • https://s3.amazonaws.com/taguxif/texas_jurisprudence_exam_lpc_study_guide.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_off0000c6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C9 5340 bytes
SHA-256: 6c126cd8d7da76a0f60e91aed4bdc6370e20b5567ade8f3d532d66e6fdb0bba1
font_01_sfnt_off0000d8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BE 9084 bytes
SHA-256: 6bf478d52f61d74571bead6205265026025612249efb89ae92708bab0bbb4588
font_02_sfnt_off0000f7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D6 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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