Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ad4d9ab704787e5…

MALICIOUS

PDF

80.1 KB Created: 2021-09-08 19:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8aa4f67c0eafaced06d54f4ec216587b SHA-1: 54d79aafc297d2d29ae13dedf9a025f03a6e8264 SHA-256: 2ad4d9ab704787e55c1f62098b78729ae4df180e2380ddd0c0fef1545c4ce50b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV and a machine learning classifier as malicious. It contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm, suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to obscure the true destination. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly suggest a malicious intent to redirect the user.

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 http://torremaggiore.sitmap.it/files/files/32833783537.pdf In PDF document text
    • http://dieta-plus.pl/userfiles/file/forulali.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613238ce28325---77140749759.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/rulosowugajori.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/42692183350.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/65616318167.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/wagazemezinizoku.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/73845298383.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/sagemog.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/12073868030.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/kejenavupefiduwutomazez.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/gijobibapower.pdfIn PDF document text
    • http://konberdbio.com/upload/files/pofoxixudin.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/89049398480.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/sasoxeputibuk.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/lijijudulesivu.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/motumetitegufupev.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/83972582851.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/93075046958.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/nujipodowerunaruj.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/bakilijusu.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/31088964982.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/70437522967.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=superchips+flashpaq+3872+manualPDF link annotation
    • 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_off0000d256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD256 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA68 17604 bytes
SHA-256: 3dfb77a5251304a9b3e84d6c89ba9a34404936cc94cd10db7de8c443fdbcbf0c
font_02_sfnt_off0001184f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184F 11396 bytes
SHA-256: 74a652263c66e746b32f8221914862646a99b8f2f0dd0cd99731cfbe62c14500

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