Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbfc7862d68055b8…

MALICIOUS

PDF

68.5 KB Created: 2021-01-13 19:53:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c1b87596c8437f72e7cd10113a610556 SHA-1: 6d743c73e045a5dec5aac5fae3cbc06775912345 SHA-256: bbfc7862d68055b875ec93809019f4eaf5e02ca90c1a957b170cdf8d4055f975
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, forming a link farm. One critical heuristic indicates a link to known malicious redirector infrastructure. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the presence of a link farm and malicious redirector strongly indicates an attempt to lure users to malicious sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=blue+is+the+warmest+colour+script+pdf In PDF document text
    • https://site-1168081.mozfiles.com/files/1168081/neogeo_mini_international_version.pdfIn PDF document text
    • https://nijawefevijabit.weebly.com/uploads/1/3/4/6/134665626/82254db54ae.pdfIn PDF document text
    • https://cdn.sqhk.co/wefenosefob/aheae5J/19375883386.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447437/normal_5fb2e762e3b22.pdfIn PDF document text
    • https://cdn.sqhk.co/tokarikadez/lwiiIhQ/povomepezepaziside.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372740/normal_5fba728d82fc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407986/normal_5fe8ff154c9e1.pdfIn PDF document text
    • https://cdn.sqhk.co/tozegatopaxu/dSibg7D/police_radio_notification_sound_mp3.pdfIn PDF document text
    • https://cdn.sqhk.co/bulixanejad/djgjg32/nenojakepebiliwovogo.pdfIn PDF document text
    • https://cdn.sqhk.co/rigowodikot/ihggdhi/facebook_marketplace_mn.pdfIn PDF document text
    • https://site-1174882.mozfiles.com/files/1174882/4473755734.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459777/normal_5fbe7ae6dc176.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457318/normal_5fc69db420a93.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373986/normal_5fce17fde63f9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000cdf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF2 5536 bytes
SHA-256: 550d94a3c2255e74c56803cbd23a2c89679293a69a7eb5a15568556b9ae7cfdb
font_01_sfnt_off0000e0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B3 10740 bytes
SHA-256: 0e807f464d7039eaaeb84f5e228292c442526c897c1193d7b38bab956b49e867

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