Malicious PDF — malware analysis report

Static analysis result for SHA-256 002b7c7f0f75d06a…

MALICIOUS

PDF

81.6 KB Created: 2021-09-10 01:33:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 45fc86b53b8663eab76498ff633d9ddd SHA-1: 230e382cbc36be301918e1e390cdda8a070c249d SHA-256: 002b7c7f0f75d06a095c4e96bdff78b53682d87428fee7ccb7701920880ff7c9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. This suggests the primary purpose is to redirect users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://coretry.ru/uplcv?utm_term=find+number+of+terms+in+arithmetic+series+given+sum PDF link annotation
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/29973785913.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/52286059628.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/wibedabipikaketat.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/41956047362.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/80141879453.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/47311321752.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/38984857635.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1631189331.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/gulagoxudoladapumali.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/refamejemowezef.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/31223834606.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133a5a71c503---13208944103.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xobiwegonibogimobaxonuso.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/29912777328.pdfIn PDF document text
    • http://df-2.de/images/daten/file/22272211854.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/1841371785.pdfIn PDF document text
    • http://parfumland.sk/upl/jozuw.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/21402603628.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f854294697---joleluk.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/44865807193.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/raropitusi.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/guwumabovakujefuso.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/56662937552.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_off0000d59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB6 11160 bytes
SHA-256: 9e0a3c80278b0f627e7e57583e6a30fd5aa858d23042fbfd71016405dd51f032
font_02_sfnt_off00010764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10764 18760 bytes
SHA-256: ea3008532a3dad985915a54102166b2fd14c4c0f0b5e07cc7eb046cbca5bb343

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