Malicious PDF — malware analysis report

Static analysis result for SHA-256 242c2495f67abec5…

MALICIOUS

PDF

69.4 KB Created: 2021-01-04 08:46:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 305a1b6157171d4452d0f75de9e4a0a1 SHA-1: 19d0c2823fd9226f618fdc45f18959f109fadd24 SHA-256: 242c2495f67abec5561711cef293a5b8159934c1ad6b36c349592f4e580c6136
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a 'PDF_SEO_LINK_FARM' suggesting a mass distribution of links. One prominent URL, 'https://traffnew.ru/123?utm_term=grammar+diagnostic+test+online', is presented in the document body, indicating a lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery.

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://traffnew.ru/123?utm_term=grammar+diagnostic+test+online PDF link annotation
    • https://nuxagaselupig.weebly.com/uploads/1/3/4/0/134016775/towetagowamax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487905/normal_5fa9a6628af82.pdfIn PDF document text
    • https://cdn.sqhk.co/sunidoxil/cjhhed2/nfl_scores_week_4_predictions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409396/normal_5fd6531520595.pdfIn PDF document text
    • https://biziliwedurukax.weebly.com/uploads/1/3/4/8/134889104/9560076.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc4fc5b0-5447-4149-b322-f81c07b419cb/christmas_weather_theme_pack_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/final_report_card_comments_for_grade_3.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/another_miss_oh_ost.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/free_itc_credit_report_south_africa.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/99819796961.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16fd1fc9-9a2a-4951-8687-913eb155636a/estudo_bblico_catlico.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_off0000d2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A3 5292 bytes
SHA-256: d868bba9e5b581c0862dd3aa062a073a703861faa7cfb07861e44c30c013c21b
font_01_sfnt_off0000e48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48B 10812 bytes
SHA-256: d452d3a387bd9d76cb6a6128761e8d4d1bd78ed5dfe3af8145ab0c3176302efe

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