Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce2a042b1dd1b7a8…

MALICIOUS

PDF

84.5 KB Created: 2021-09-19 04:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: b12118c33c0081cec8ad64e41d5f2d7e SHA-1: 6934907c989893e5c74c6ed37966da6e2b2208ad SHA-256: ce2a042b1dd1b7a8f614e0e659d8bf9a8ac03fa20858cea742185f71551e2a9e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to disposable hosting or link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=aesthetic+note+taking+apps+for+android PDF link annotation
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161464cdf7af5b---41667265882.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/jedojumubosabuse.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/xatanar.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/xesubigetepoxunasol.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/489988823.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/magixu.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109190558123835.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/13836928099.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139998aa405d---26448172587.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/3235054701.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/68959470721.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/59861396299.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/62211381205.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/viberipal.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/30384561369.pdfIn PDF document text
    • http://wawa757.com/uploads/files/77536872706.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/fozekaxofaseraxu.pdfIn PDF document text
    • https://olterus.net/contents/files/17478711547.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/jepibawo.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/besaninoxujakev.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/23545366107.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/26919854809.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/87913265683.pdfIn PDF document text
    • http://fgosvo.ru/files/files/judobaregijedulowanewenek.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://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_off0000e648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE648 17408 bytes
SHA-256: 323e616316ffb134842dbd8250ef86dd460721f726b21fa31e785990ec1224b2
font_01_sfnt_off0001131f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B36 10928 bytes
SHA-256: 3b55246d5fb4d18378d0039fb9672823d3b32f9858d3bbdde9dcc6b78df142b9