Malicious PDF — malware analysis report

Static analysis result for SHA-256 b384365a24ef7390…

MALICIOUS

PDF

70.3 KB Created: 2020-12-09 09:08:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 283206e2b0dd1256365ff5a0719fe7ae SHA-1: 0ecb2e65fec1d9c1f5f2567fcfa42a5d6558ddf0 SHA-256: b384365a24ef73902a7698acb17dc643da3d9cbe2ff8e6174a88c65971a2afea
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are to suspicious domains, indicating a link farm or phishing attempt. The heuristic PDF_SEO_LINK_FARM specifically flags this behavior. While no scripts were directly extracted, the presence of embedded URLs and the ML classifier's high confidence score suggest malicious intent, likely to redirect 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
  • 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/123?utm_term=book+of+mormon+study+guide+pdf PDF link annotation
    • https://jobozisibipiw.weebly.com/uploads/1/3/4/5/134581899/tupetopiberewed-bepega.pdfIn PDF document text
    • https://jetosiwer.weebly.com/uploads/1/3/4/7/134767378/4be27de9d55.pdfIn PDF document text
    • https://mimevomakiket.weebly.com/uploads/1/3/4/6/134693464/fifofotufuku_bukujozepu_rotevuvogob.pdfIn PDF document text
    • https://posanawefu.weebly.com/uploads/1/3/4/7/134711745/kujixefu.pdfIn PDF document text
    • https://pomisefinare.weebly.com/uploads/1/3/4/9/134902228/f70685385de1f4.pdfIn PDF document text
    • https://tudupumodowi.weebly.com/uploads/1/3/1/4/131406798/nenanofot.pdfIn PDF document text
    • https://dogewirezuv.weebly.com/uploads/1/3/4/6/134699505/c2ca7e66.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/ragejufa/how_often_do_dubia_roaches_eat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34e22428-ab4c-4edf-b8f3-0f7b782c7cd3/noble_maiden_fair_lyrics_pronunciati.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8da6971-cc2c-427f-b952-b424446a6d7b/bamepumoduzafekobi.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/salolotuduxone.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/50134335835.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/69522358782.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/89007900387.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/47447461861.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_off0000d6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F0 5332 bytes
SHA-256: e08a933e00fcfff9fa415df36f57b8dd02580e4e05dcc1f3f6c822b3513f2681
font_01_sfnt_off0000e917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE917 10220 bytes
SHA-256: 40287ccb99146fb54b38338f7b4b294fa71108d73de674baa55a8bf929ea1f2d

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