Malicious PDF — malware analysis report

Static analysis result for SHA-256 8105c781c926c2bb…

MALICIOUS

PDF

72.5 KB Created: 2021-02-20 02:57:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6bc4faf4bee2e9944f674a882fb524d9 SHA-1: 6ce39e2cf73a37c7786bed6ecedd0cb170aec72b SHA-256: 8105c781c926c2bbfad70eea04bbad07bd30d2ff225cc384025ed78baf9e031f
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs that point to known malicious redirectors and link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to lure users to malicious sites, likely for credential harvesting or further payload delivery.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://yafferge.ru/wb?keyword=can%20cohen In PDF document text
    • https://cdn.sqhk.co/jabosuve/apjgifT/school_tuition_management_software.pdfIn PDF document text
    • http://firstreadersclub.com/john_grisham_a_time_for_mercy_paperbackxbmk4.pdfIn PDF document text
    • https://cdn.sqhk.co/tabuguran/igXkifl/farming_tractor_drive_simulator_tractor_game.pdfIn PDF document text
    • http://nonretloli.site/95759832328mgdmo.pdfIn PDF document text
    • http://remont-kholodilnikov.website/86508925733ux30r.pdfIn PDF document text
    • https://cdn.sqhk.co/mapetidul/Ooji4TH/zarchiver_pro_apk_house.pdfIn PDF document text
    • http://app-3null.com/dukafozerunagojesappq6g9.pdfIn PDF document text
    • http://blog-millionaire.buzz/calculating_magnification_worksheetouzbj.pdfIn PDF document text
    • https://cdn.sqhk.co/pibutuvopedu/xF8jbJl/38285529650.pdfIn PDF document text
    • https://cdn.sqhk.co/verexumifo/jaAhbgc/95757902144.pdfIn PDF document text
    • http://elerctum.org/gallstone_guidelinetsxfn.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
    • http://bokatamekal.rf.gd/43958368105.pdfIn PDF document text
    • http://pitugozuput.epizy.com/46960671568.pdfIn PDF document text
    • http://vorinemoxolupip.rf.gd/small_baby_birthday_songs.pdfIn PDF document text
    • http://pusupap.rf.gd/logifumofatozalofosiw.pdfIn PDF document text
    • http://ragigixo.epizy.com/puzzles_and_riddles_in_maths_with_answers.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_off0000cfff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFF 5248 bytes
SHA-256: a7bf7906c3690df6c85dbf067540a4d1a8ca00850183370e2c34b066ce752036
font_01_sfnt_off0000e1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F1 10924 bytes
SHA-256: d01b91771914279db319bb9c68816feb76ba7480c4cd7686725d13c1b4c23ad6
font_02_sfnt_off000106d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D5 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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