Malicious PDF — malware analysis report

Static analysis result for SHA-256 303bc0945059251e…

MALICIOUS

PDF

68.9 KB Created: 2021-09-27 15:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 809a6b92fa8576cde168eeddbfa990ad SHA-1: b87d07eac5ccd0cdef3bee6385c2c796d77d2d3d SHA-256: 303bc0945059251e482fba37aaec2b77d79387687ad522025af144a58106dedd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external URIs, with a notable one pointing to 'inwebjor.ru', suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a structure designed to host many links on disposable domains, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://inwebjor.ru/uplcv?utm_term=aladdin+film+full+movie PDF link annotation
    • http://csc0535.com/userfiles/file/20210912064642_aupx13.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/25553351813.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614127cd21bd3---40015934703.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/98634978581.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/putiteru.pdfIn PDF document text
    • https://mattress-leader.com/media/94701797390.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/zafeluwaw.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210917_AD46E07C87410BD1.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/komijofixirasarizipiko.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/kamus.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/65418598641.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/47218640601.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16312322629202.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/b15q32mb673hf6587jicqnqh2t/wutovujewepejekud.pdfIn PDF document text
    • http://chinalabware.ru/d/files/joposewu.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/lolik.pdfIn PDF document text
    • http://centromp.it/userfiles/files/golilu.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/venafunetarinaredenes.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/58490990083.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/gomexekesamimop.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/sapimosiwejonezaxivemes.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_off0000adca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADCA 16152 bytes
SHA-256: 2450fd79bf157004f467648eb4f3156f13e842449ef977bb2412518853ebdcf5
font_01_sfnt_off0000d6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F1 10296 bytes
SHA-256: 125ac2dc70113062dabbc655bbb11db18742e43b910983eb6f58fc28d381189f
font_02_sfnt_off0000ee0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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