Malicious PDF — malware analysis report

Static analysis result for SHA-256 3151e45f5c47bde7…

MALICIOUS

PDF

101.2 KB Created: 2020-11-27 20:56:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: dce0bc8e97f8ac334cff30e9f522fe86 SHA-1: 1b5a0a2c087dca324759bfdc3a51382d20eb602a SHA-256: 3151e45f5c47bde7b510df7cf0b29ac8676aabb26be8899860e08ec9e4d8a927
96 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. It contains embedded URIs, with the primary one being `https://trafftec.ru/123?utm_term=construct+binary+tree+from+preorder+and+inorder+traversal+lintcode`, which likely leads to a phishing or malware distribution site. The presence of embedded URIs suggests an attempt to redirect the user to external content, consistent with phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/123?utm_term=construct+binary+tree+from+preorder+and+inorder+traversal+lintcode PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386349/normal_5fa617eca4e77.pdfIn PDF document text
    • https://xipinirobidojuv.weebly.com/uploads/1/3/4/0/134017625/keketesebebux_lusoxa.pdfIn PDF document text
    • https://towalexurunodu.weebly.com/uploads/1/3/4/2/134266150/mafibidut_kowijewamajexob_xefiwuvi.pdfIn PDF document text
    • https://kejifesabateg.weebly.com/uploads/1/3/4/8/134847793/nusazin_rasimetadupud_gevoges.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369630/normal_5f91e5c3404f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383449/normal_5f9a108af21f6.pdfIn PDF document text
    • https://kurikezexiwu.weebly.com/uploads/1/3/0/7/130775092/wijanozimojozapok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e8e56cf-c184-4f65-90bb-3321f31c04fd/shadow_fight_2_mod_apk_download_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccbc6366-bdda-4b3f-b9a3-6c6cfc2d8268/39496822668.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/mugunokeginopaxalopaguf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/797dee79-b569-45ba-9be7-9ece8f607022/46013391065.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_off000152f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152F7 5508 bytes
SHA-256: 8a788793b2e3f35015f36c8fc817ca22fcd6cc7d5f59541cd711ffd137e3bf7e
font_01_sfnt_off000165a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165A4 9856 bytes
SHA-256: bc8658a5fdd24ed5c4529d83ccbd09fa67abb57f151c3131c8b4d9a8a23a85d7