Malicious PDF — malware analysis report

Static analysis result for SHA-256 410642957b3f8864…

MALICIOUS

PDF

74.1 KB Created: 2020-12-27 06:46:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a6f4bfe550ada010b5e8eef580e35bc1 SHA-1: 5290ab8df2345880d18e75f0ed7110f3b34dbbb1 SHA-256: 410642957b3f886406dc19d0833b996445abcc8a666a1a7a77ab8049fb077a0a
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the PDF and the embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

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://trafftec.ru/123?utm_term=variegated+monstera+deliciosa+borsigiana PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418362/normal_5fb29c56862d4.pdfIn PDF document text
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/sisedebani_bubamo_xakegepakibagem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530846/normal_5fb7b7e857baf.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/susonanezaj/85304695622.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/jukutezawofikonerodom.pdfIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/38790025815.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/xawukerebigurunawogefep.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/jokuti.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/gisobutug.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/sheet_music_chopin_nocturne_op_9.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_off0000e49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49B 5364 bytes
SHA-256: 8851fa39ad563128df5e86d62e5b06c694f56e98f6c51dd06c006a1e05c5a5f4
font_01_sfnt_off0000f6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C2 10800 bytes
SHA-256: 8c3479258d6871fabddda59fd789d919d32e97249a1aad22bf6512b25760e2b7

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