Malicious PDF — malware analysis report

Static analysis result for SHA-256 955f0bad5581cadb…

MALICIOUS

PDF

66.5 KB Created: 2020-11-20 12:48:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6361c2c6a273a63d513fc4c8e4e63362 SHA-1: 800394b3c7cfa4fa1fb952ae4e40e4376f7e8339 SHA-256: 955f0bad5581cadbead1dc3b3d6f27914cc21cbb1a8b5af67ff044bf450e91cb
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, with one pointing to a suspicious URL that is likely used for phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to 'drum transcriptions'. No scripts were extracted, but the presence of numerous external links and the overall detection profile strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=drum+transcriptions+collection PDF link annotation
    • https://biwazasidatuf.weebly.com/uploads/1/3/4/3/134373857/b816d1a3cd.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/tesasubawalozan/zewesopovo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c49a5988-3460-4377-8eb1-e8d99617e9ba/belifepowalumip.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/mongoose_brawler_20_inch.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/cerere_cazier_judiciar_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/murray_m2550_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fa97075-c393-42ac-ae06-5fd320734ded/22437028502.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/typhoid_fever_test_report_normal_range.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63d14e9e-efb8-4b0d-928c-594dddd90652/ramilozobowinisulib.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/acceder_icloud_drive_android.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_off0000c7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E8 5076 bytes
SHA-256: 3cf1be89e3a498263f880029555dddfc0925ae0d91a72d8f6c8a29a6f6a012a8
font_01_sfnt_off0000d917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD917 10676 bytes
SHA-256: 314440b4e75ba025fc36b22977f8111d9c0a195cf2d3f0651b04b74b054cc0ff

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