Malicious PDF — malware analysis report

Static analysis result for SHA-256 80954c7537bf27d3…

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 03:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: fdd14d07ffa2debfa3af7947e3236a94 SHA-1: 956ef03fb10738b386c3fbd186419fa80a69a19d SHA-256: 80954c7537bf27d3ff36c7d39b38c2e39db68872bb6a58e085de93696c851b3d
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous embedded URIs, with one pointing directly to an IP address, suggesting it's part of a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to obscure the final destination. While no scripts were explicitly extracted, the nature of the heuristics and the embedded URLs strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136642bd541c---vazabogexepapawopelalivu.pdf In PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161448f72598e2---59434323243.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/pusojokiriwopixoxekugo.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/27015931833.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/sivosafuzit.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/roxonasasepuv.pdfIn PDF document text
    • https://theipbuzz.com/images/file/xisogefejaze.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021091803540284.pdfIn PDF document text
    • http://heichapuzi.com/uploadfile/file/fenuturenumidezuxigidijuw.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/22310299367.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/28846785486.pdfPDF link annotation
    • https://ceccargiurgiu.ro/userfiles/file/migukoguzaperajutisilenog.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/lifefakisowug.pdfIn PDF document text
    • https://rajakedua.com/contents/files/wutogi.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/68819409913.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/92928897766.pdfIn PDF document text
    • http://dyccpharma.com/upload/files/79893996319.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210903155317.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/vegixipixotejat.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/bavitoruwatesaz.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/fawedaf.pdfIn PDF document text
    • http://jamxmpharmatech.com/upload/files/bililomakewukipozo.pdfIn PDF document text
    • https://andhimazhai.com/images/files/dovegesepezowe.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/ritojegofaxazezidori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=utorrent+films+download+sitePDF 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_off0000d25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25B 18968 bytes
SHA-256: 414fdcd4d0314f81824504eaecdd67f864ffabd8125e26395ca2b8b2db9b6552
font_01_sfnt_off000103ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AD 10608 bytes
SHA-256: 08bfb16bd8fdc989fdac093b29bc6c71d5bf640e5af7266fac6e6998802e9df9
font_02_sfnt_off00011bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1