Malicious PDF — malware analysis report

Static analysis result for SHA-256 a31c329dc9814a7a…

MALICIOUS

PDF

82.8 KB Created: 2021-03-14 11:34:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 78bd627b506cb7d350e01dd5ef7b1200 SHA-1: e3d3aa90d9a2d036ac481840ef49fc9d060e7151 SHA-256: a31c329dc9814a7a1dcdc20e38bdc882f7b35926b8d305512822bac5d047e2aa
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a PDF link farm, with one prominent URL pointing to a suspicious domain. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious content.

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://xajibur.ru/strik?utm_term=what+is+system+engineering+process PDF link annotation
    • https://vamububok.weebly.com/uploads/1/3/5/3/135317225/vonakefu-jozul.pdfIn PDF document text
    • http://dkshlyap.ru/american_ninja_warrior_apkqc0e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426687/normal_603869794e7a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450733/normal_6032e0863915e.pdfIn PDF document text
    • http://sayfelengs.space/gizomofetalivefomx3dm7.pdfIn PDF document text
    • http://copyrightsupporteds.com/wevedamatatonakajubuki5nm.pdfIn PDF document text
    • http://bridgecommerce.com/organizational_structure_definitionnoj4z.pdfIn PDF document text
    • http://gefejisu.22web.org/betternet_premium_apkmb.pdfIn PDF document text
    • http://twitter-center.com/driver_impresora_hp_laserjet_pro_400_color_m451dwvpi8u.pdfIn PDF document text
    • https://dulewexafup.weebly.com/uploads/1/3/4/7/134702005/bogobe.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/zugutixe/free_html5_css_responsive_website_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/zepoxozira.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/pezawokax.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/fuwapitanibexereviruxu.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/25232818978.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/femixagu.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/angiospermas_dicotiledoneas.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/jezub.pdfIn PDF document text
    • http://xugivikiseb.rf.gd/79124956260.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E3 5428 bytes
SHA-256: 590cc771b552b713b64dc9fa9e9e3c0f10b6ddeeb1ec3fd3901d7a53241053d1
font_01_sfnt_off00011847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11847 10884 bytes
SHA-256: 4171b78cf8b6dee3477f5d2c87b665e265f3a75eef3b268db248b8e8ac45c493

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