Malicious PDF — malware analysis report

Static analysis result for SHA-256 4215d362acf53f53…

MALICIOUS

PDF

82.3 KB Created: 2021-10-05 07:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3ed5edc7d0dab5c7cae4490686f22617 SHA-1: 9f6e088b16c60651dc59a5c34eb72784d11d7fc2 SHA-256: 4215d362acf53f53bf0f25c5f879a40038e6ae4659e59bd543cb3144bf96a909
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are part of link farms on disposable hosting, suggesting a phishing or credential harvesting campaign. The presence of PDF-specific heuristics like PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM further supports this. No scripts were extracted, but the overall structure points to a malicious document designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://crysiq.ru/uplcv?utm_term=view+pdf+without+downloading PDF link annotation
    • http://ocean-ex.com/images/blog/file/38109602932.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/ratenisosotelodipevifewig.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20211005110519_0jzaht.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/46258834496.pdfIn PDF document text
    • http://hopkim.vn/upload/files/93338477431.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/nirixobowejabifebak.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/48104418050.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/37663517064.pdfIn PDF document text
    • https://produccion.formacion2puntocero.com/ckfinder/userfiles/files/25026664553.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/pamiperugobudubunonera.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/400324d652e26178184b1adc229f0040.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/67429721663.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/pibezonidumi.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/577724762.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/fofefogar.pdfIn PDF document text
    • https://music-group-store.com/upload/files/zukolireredexesus.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/tukopotobad.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/50260702288.pdfIn PDF document text
    • https://norservis.info/files/files/21179084984.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/49826064485.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/40168473348.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_off0000da5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5D 10664 bytes
SHA-256: 9276cbe697bc9e5ecb55707bf1eff213524b62bf6b85c0cd01504c51a08d6d62
font_01_sfnt_off0000f296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF296 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA8 18888 bytes
SHA-256: e1159c85a411373731ae3259a05c440d44db96eb1f79090c1f67e2ab5cd5c096

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