Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f2569d4f042bd5…

MALICIOUS

PDF

78.6 KB Created: 2021-01-22 21:13:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: fd06701aefdce7d18143c8ec534c1663 SHA-1: 03f56214a8806c2aff267c7650e95dfedc8a9d04 SHA-256: 77f2569d4f042bd52735da15fe4b58e32e8293231d23aa3fd0f9a34b9527aa16
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 as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. The PDF contains a large number of external links, indicating a link farm or a phishing attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the document is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/123?utm_term=can+bearded+dragons+eat+cuties+oranges PDF link annotation
    • https://rotarivinevi.weebly.com/uploads/1/3/4/5/134599250/mutuj.pdfIn PDF document text
    • https://wibakaxidame.weebly.com/uploads/1/3/2/7/132741334/b70fa71620.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468537/normal_600062dedd3e7.pdfIn PDF document text
    • https://rewojomivatal.weebly.com/uploads/1/3/5/3/135345623/tenixosupidiwodamu.pdfIn PDF document text
    • https://movireralu.weebly.com/uploads/1/3/4/8/134879142/2996271.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464852/normal_6008ff90ecc8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476148/normal_5ffc12da46126.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482849/normal_5fc7429f10b27.pdfIn PDF document text
    • https://gizivesokopupa.weebly.com/uploads/1/3/2/6/132696604/2794912.pdfIn PDF document text
    • https://pewatusikowago.weebly.com/uploads/1/3/2/6/132683224/zewogerurifinusu.pdfIn PDF document text
    • https://luzidasagozoro.weebly.com/uploads/1/3/4/3/134319964/e01adcd132768.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/lopeteb/ipad_ibooks_highlight.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/skype_for_android_phones_samsung.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/creative_writing_template_ks2.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/ruwuwalono.pdfIn PDF document text
    • https://s3.amazonaws.com/tulosa/libukinowut.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE872 5120 bytes
SHA-256: c47bb1dd62e89b9cf84d256addb51982f1669250d617890dade099556083ef83
font_01_sfnt_off0000f9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E6 10712 bytes
SHA-256: 526bbca0b0ba88f63cab1954561629d7fc5ce177a81c806785fabe17f08b469d
font_02_sfnt_off00011e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8E 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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