Malicious PDF — malware analysis report

Static analysis result for SHA-256 de744a47c077d734…

MALICIOUS

PDF

82.0 KB Created: 2021-09-11 08:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1762fa9a2d5e11822b664857348545f7 SHA-1: a5f3aeab98580c256fa9bcec1545c0b5d0a6eebf SHA-256: de744a47c077d7344b7084d0877c526291e303f63d857ebb4fc8e17d4af60c2b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs pointing to PDF files hosted on various domains, suggesting a link farm designed to distribute malicious content. While no scripts were directly extracted, the PDF structure and embedded URIs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 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.
  • 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://best-label.com/upload/files/segibowavazebozijozebuze.pdf In PDF document text
    • http://togul.org/sites/default/files/file/zejimi.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/82242394284.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/dijalaxepuziruwatesa.pdfIn PDF document text
    • http://jcpingie.be/public/files/kimafebilalusob.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109030928324155.pdfIn PDF document text
    • http://archbot.pl/files/file/19682271558.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/gijeraguto.pdfIn PDF document text
    • https://zhansq.cn/upload/file/51007101682.pdfIn PDF document text
    • https://armenia4d.com/contents/files/zozuwulenokogofebolaparo.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/49699433854.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/54056718874.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/mevideb.pdfIn PDF document text
    • http://poliinc.com/upload/files/kejemurubiwitikenenuwus.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/funifejutironazoloriwejuw.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/56639309490.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/76827335638.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/79547003291.pdfIn PDF document text
    • http://hainfelderteich.at/30713167825.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/jobituw.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/89177936906.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/88577794767.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=download+phone+clone+apkPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE01 17612 bytes
SHA-256: ea693332521d4f61775f14856091eed6e0eaed2cbe8d6cc7905446cb3f3f8beb
font_01_sfnt_off00010b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12360 10332 bytes
SHA-256: 8d5a8c232af2b36ee7c5e09a15644929b932c4ea1854dd3b94b266de734ce131

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