Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c7a582d018448f…

MALICIOUS

PDF

80.6 KB Created: 2021-01-16 14:02:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4ccd1a881bf01fb50b037a64fee27f27 SHA-1: d933965a3d2b25a72e39c11e80719fd86f12be9f SHA-256: d5c7a582d018448f8a7be8adec23ec0462f0c1edf9e69384a3b81186fc739ec2
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The presence of a large number of external links, identified as a 'PDF_SEO_LINK_FARM', suggests a tactic to manipulate search results or redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and link farm indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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=battery+doctor+apk+for+android PDF link annotation
    • https://site-1166653.mozfiles.com/files/1166653/27323202701.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369183/normal_5f87bea990558.pdfIn PDF document text
    • https://namosupegu.weebly.com/uploads/1/3/4/3/134313644/subosure_tixivob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369317/normal_5faaff2cabe5e.pdfIn PDF document text
    • https://site-1176955.mozfiles.com/files/1176955/37580319580.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495691/normal_5fd3372f4d1c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373505/normal_5f9f1f4c418de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421062/normal_5fe56b8f39fee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410201/normal_5fe7219a7b281.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/pubopelej/bifilar_suspension_lab_report.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/54457612316.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C5 5156 bytes
SHA-256: 3772dd1b42a5db742506439672e38eef187f372c35455807c1e22debfc3d1699
font_01_sfnt_off0000e86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86A 4572 bytes
SHA-256: dd4384cfc6c69efc4c09e17b83d0b8ab6fec3d1ed8c94d7525f8ce57b845fed5
font_02_sfnt_off0000f9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E4 11132 bytes
SHA-256: 5d6f48afc22128187736a29cc643e924f7cf7b1f5b92e4869fd8ea9c246b754e
font_03_sfnt_off00011fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFF 16232 bytes
SHA-256: 8c4f20850708d391b115a482448c651f2a982fbdf20ce527d670e7cbafe14b49

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