Malicious PDF — malware analysis report

Static analysis result for SHA-256 73f443f5448fe5b6…

MALICIOUS

PDF

68.0 KB Created: 2020-12-24 06:47:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 7702f5de92b1c6585acf7ec2043bee8e SHA-1: 95039b27529fe78b907747e514d5a81a4fd009f8 SHA-256: 73f443f5448fe5b6918c4fa200ee8c27e7be61dbd6353194987f2783907b7e9d
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains an embedded URL that points to a suspicious domain, likely intended to deliver a malicious payload. ClamAV detection and ML classification strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to software stencils.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/aws?utm_term=bpmn+2.+0+stencil+for+visio+2010 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388627/normal_5f8f351ff3512.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454682/normal_5fb340bc9457b.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/059d55fbff3.pdfIn PDF document text
    • https://xuwixozewinufub.weebly.com/uploads/1/3/4/7/134702679/sitefezeg-zefudojibigo-lugivig.pdfIn PDF document text
    • https://feroredo.weebly.com/uploads/1/3/1/3/131379294/5626110.pdfIn PDF document text
    • https://vonubaxuted.weebly.com/uploads/1/3/1/4/131452839/fedug.pdfIn PDF document text
    • https://tadomowiwelam.weebly.com/uploads/1/3/4/7/134744739/vevefuzu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388427/normal_5fb2cb1007458.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/jeduzizonox/formas_de_maltrato_psicologico_a_la_mujer.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/wafitisidonaxegasak.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_off0000ca87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA87 5420 bytes
SHA-256: e97cc8d9befe656624bbdaf7323727ad94e897cf74ede0457c19339b43d24f80
font_01_sfnt_off0000dcff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFF 11060 bytes
SHA-256: f8c455036bf57294eb5004437d4ba6003d63240c0f6663f8d18331ed1396b5ae

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