Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e31b2c1a9da6a5e…

MALICIOUS

PDF

69.1 KB Created: 2021-09-16 18:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 157cd4d3f15b89b2a613075276483904 SHA-1: 4d754e44acd335d7b9bf3c213ffe6bf84dbd61b5 SHA-256: 7e31b2c1a9da6a5e1e84581ae72f166dcc6b81372e6e9dfb9428948b1bb9bf55
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing and trojan activity. The presence of external URIs and a link farm on disposable hosting reinforces the attack pattern of luring users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://allytemp.ru/uplcv?utm_term=download+gps+speedometer PDF link annotation
    • http://dlzj.net/upload/files/202109100518397272.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/16605740937.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/niwujetagakabopuj.pdfIn PDF document text
    • http://artediapharma.com/upload/files/titejivavelewesubimaf.pdfIn PDF document text
    • http://landpas.pl/upload/file/xebawosuzikige.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/50860121557.pdfIn PDF document text
    • http://didopack.com/files/piwes.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/katatiwujenudufesevukuv.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/ragelaxazeradevalijufaz.pdfPDF link annotation
    • http://artiguardia.pl/userfiles/file/13837791097.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/66601754475.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/42124022751.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/nazukugixujinuberusam.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/7153941747.pdfIn PDF document text
    • http://daydeothe.vn/rich_editor/file/rababumelapabixajekizub.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/40624852060.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/midasuripapapetabisom.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/cabeb156960e4d695652eacf4ff98b0d/31235185995.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/44597756080.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/93603621846.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1630665496.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/tonidobimonil.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_off0000b082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB082 14892 bytes
SHA-256: d454c71252854eabdd833587732d1a1c06a4c71f6d8a045aaba703eac15cbc7f
font_01_sfnt_off0000d61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61C 10732 bytes
SHA-256: c7c9bc446a7e00fdec97ce0f2ebd73f13b8ebefe12458e4a71e612fcf7de5604
font_02_sfnt_off0000eea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1