Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4fc107cfe21e5f4…

MALICIOUS

PDF

69.1 KB Created: 2020-12-18 13:44:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5aae039a68ac51a946e6ae78f5adb77c SHA-1: b14299ee54aa3e83c71eac4f8a13371f8f084f23 SHA-256: d4fc107cfe21e5f4baca1115e4587438bca7c1a73c13dbb31e8aba1452139bbc
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/strik?utm_term=area+code+774+usa PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480753/normal_5faf0a2cb235c.pdfIn PDF document text
    • https://tazavujaxiruvo.weebly.com/uploads/1/3/4/7/134746990/wowiro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473890/normal_5fae5495e1fce.pdfIn PDF document text
    • https://nilowebun.weebly.com/uploads/1/3/4/7/134751503/3095665.pdfIn PDF document text
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/5075791.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/b60a1aea-ac22-4148-a36f-838ce5e0530f/13584936262.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f73af98f-d3b1-4ec0-818a-0d4e48a81e67/eclipse_path_2017_time.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc51642239b0722914c4266/t/5fcf265710aae775716adbaf/1607411287772/7753473074.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5094024b06a7eb31a0bf1/t/5fcb6710190ee82df8dc1267/1607165716575/tap_tap_dash_game_app_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50da056a-a84c-463a-b29e-8cd8af8c21ef/xinoduma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78527114-e3b2-4514-b46e-d7ab3e957120/24111505314.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_off0000d43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43A 5056 bytes
SHA-256: 12e90ffa295316ecc8070514bf3d5e9c99e8101b51e203fe58ae2fec572c16ce
font_01_sfnt_off0000e584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE584 10092 bytes
SHA-256: 5bfa53595e9db5be331f78824c7b932dc6d931fbbea0c643751bc4756c8cd393