Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40077a17875eabd…

MALICIOUS

PDF

59.9 KB Created: 2020-12-17 01:54:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 87f594cb98404f5947e2df1c23d24c65 SHA-1: 153b371ea4d6fbf60122412488429364273be2a0 SHA-256: b40077a17875eabd19ff5a5303cc91dd0066b0f5ccf1a8030780e2dcd58bc10d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a large number of external links, a common tactic for SEO spam or phishing. The embedded URL `https://traffine.ru/aws?utm_term=signs+and+symptoms+of+gestational+diabetes+pdf` suggests a lure related to health information. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which is often used to redirect users or exploit vulnerabilities.

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://traffine.ru/aws?utm_term=signs+and+symptoms+of+gestational+diabetes+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412899/normal_5fa8e69b602d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409614/normal_5fc12f6b489d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476437/normal_5fc6df43629f9.pdfIn PDF document text
    • https://juxetume.weebly.com/uploads/1/3/4/8/134879156/vofafarewe.pdfIn PDF document text
    • https://wilubowedawiwo.weebly.com/uploads/1/3/4/5/134528918/f440153d7bba99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408586/normal_5fb675f78ae11.pdfIn PDF document text
    • https://regafuraseni.weebly.com/uploads/1/3/4/6/134663643/jorefijix-gawaxuxupu-luginokaru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394060/normal_5fa31bd1188d2.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/zemigiduwagafu/helen_keller_books.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/51183638468.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16d558a6-33db-4ee9-8fb1-710700c6b666/facts_about_the_paramecium.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_off0000af61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF61 5612 bytes
SHA-256: 9ee98554510fde3a12277647b52f01465af4db5074d671676c3e70651ba65d91
font_01_sfnt_off0000c268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC268 9420 bytes
SHA-256: 9dc7763df5252279f62b9589789ec6ccd99ea1481ed6bf49594d871a0ed16a43

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