Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b563b0bdb9cafb…

MALICIOUS

PDF

81.6 KB Created: 2021-09-10 10:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 923181522ddaa4daef8bc3080688f4bc SHA-1: 48ffcd4f6ba9912aea41a3fd6a8207513563ae0d SHA-256: d8b563b0bdb9cafb06e74fb8a0535f76b1ac672203a72fc7b00c9ff603b1cb78
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. One prominent URL, 'https://smidgel.ru/uplcv?utm_term=viber+low+storage+space', suggests a lure related to storage space, likely for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://smidgel.ru/uplcv?utm_term=viber+low+storage+space PDF link annotation
    • http://thingsantiquesla.com/userfiles/files/73985865082.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/zedilomapulobolexubawop.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349d29bb3b4---42075703505.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/41812522558.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/bojujilanuvugupiruguf.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/vetekisi.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/63987309190.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/30927010593.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/74197070003.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/19036853292.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/36687927337.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/kagagexu.pdfIn PDF document text
    • http://slsnn.ru/content/file/77353078301.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/94593525625.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210906231845.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/kotebesajaveduwoxapesa.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161380afd0b928---4142482662.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/10909186165.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/98474631071.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/90784856421.pdfIn PDF document text
    • http://boldogelet.hu/media/jebowafazemibareta.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_off0000d6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DF 10640 bytes
SHA-256: 9853a751255d79ef2137e8bfa39936836eb6ac777735b5d5dac00ee3fcc77e1d
font_01_sfnt_off0000ef3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3E 18856 bytes
SHA-256: dee6fb058b78a06bf6c1b7c822094725481ec889a546bcb87e310c91d5003c27
font_02_sfnt_off000120a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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