Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ccee6e341553530…

MALICIOUS

PDF

78.9 KB Created: 2021-03-13 21:15:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 7ef427c9f1005b1246cf306f25b65642 SHA-1: 4b0eb90cb4fd1ca32a754416d7ccdb23ecada4b5 SHA-256: 9ccee6e341553530a48b56143fca202dc6c7a87c1d3c01342cf3cdeae2ebdb01
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are disguised as search results for educational materials. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, with the primary URL being a potential phishing or malware distribution point.

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://resalured.ru/award?keyword=c+language+tutorial+for+beginners+pdf+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485703/normal_5fd073f42d15f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369164/normal_5ff0016fe98c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389604/normal_5fcf15dac33e9.pdfIn PDF document text
    • https://wutejaguruloz.weebly.com/uploads/1/3/1/8/131871665/wozizabobu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465703/normal_5fffb0e87f2ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453906/normal_5fe292479c988.pdfIn PDF document text
    • https://lefaxujil.weebly.com/uploads/1/3/0/7/130739779/wudivuxal.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/pegek/lagu_blackpink_whistle_english_version.pdfIn PDF document text
    • http://kuposefo.epizy.com/gebaz.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/84982162589.pdfIn PDF document text
    • http://kovawasokagi.epizy.com/ritemumirukagaza.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/59765867022.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/pearson_education_canada_accounting_1_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ca6a911-3e8d-4920-bc53-05e65e88552b/troy-bilt_horse_xp_hydrostatic_lawn_tractor.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/mahabharat_krishna_flute_ringtone_pagalworld._com.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/45576060756.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6791f24-5237-46cb-b3d9-98c8ad187cd8/lets_play_sherlock_holmes_the_devils_daughter.pdfIn PDF document text
    • http://tajajal.rf.gd/sufebasazozuvalinaxexij.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_off0000e57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57E 5344 bytes
SHA-256: 5aa730420ac518d526edb68c9579de4a660c543e11d76722bc5f400e9a37c92e
font_01_sfnt_off0000f7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C6 11792 bytes
SHA-256: 5549ba04cf1579427993ec68a0fcd9b016280692548049ee87aa75e75d951ce6
font_02_sfnt_off00011e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3B 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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