Malicious PDF — malware analysis report

Static analysis result for SHA-256 5896a4cd324b8239…

MALICIOUS

PDF

74.0 KB Created: 2020-12-27 22:08:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 45dfcce7e6966821d0c4aaed6120e6f6 SHA-1: 2cb7653c431329cf31e0af0ef5ca24119c020a16 SHA-256: 5896a4cd324b8239308b32626e194a6993b027167bc7fd68d1d49409f677a8e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a significant number of external links, with a critical heuristic identifying it as a PDF link farm. The primary malicious URL observed is 'https://trafffe.ru/strik?utm_term=the+lighthouse+keeper%2527+s+wife', which is likely used to distribute further malicious content or phish users. No scripts were extracted, but the structure suggests exploitation of PDF vulnerabilities to redirect users.

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://trafffe.ru/strik?utm_term=the+lighthouse+keeper%2527+s+wife PDF link annotation
    • https://vukisopir.weebly.com/uploads/1/3/0/7/130776420/8224067.pdfIn PDF document text
    • https://cdn.sqhk.co/zoturisa/hibjjYP/what_causes_red_stretch_marks_on_legs.pdfIn PDF document text
    • https://cdn.sqhk.co/kejalupegem/jjjsVif/dash_till_puff_2_pc.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/tevomenil/aap_se_milkar_ringtone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58c07ec0-1a67-45b0-be43-7f0cf3eeb7ca/77100214173.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/samsung_s8_android_10_release_date.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/answering_machine_beep_sound.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/25594962867.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d79ea926-0d01-4268-a6ad-dc2efbd79986/juzajuxivake.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/57840809534.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d8102b1-e576-4256-ac80-da0f5c894718/lomevalof.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_off0000e4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D1 5092 bytes
SHA-256: d105b20d447ec189a29dc6ec2f3afe3c8169702c852be44df9e038568d305da7
font_01_sfnt_off0000f642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF642 10792 bytes
SHA-256: c746e1206806804a7bebfbf5486bfc8583e3e49c06b8676c9699302b6875c8ea

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