Malicious PDF — malware analysis report

Static analysis result for SHA-256 7985b82d22cc109d…

MALICIOUS

PDF

72.3 KB Created: 2021-09-25 13:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 10fb562e02891f45d3d25ddd3ed1d1b0 SHA-1: a860c7746f3d92bf9d2ff570cd96483a57267842 SHA-256: 7985b82d22cc109deebc12ebddf697c7523e100ff974ff7c22f84dd0a22a8763
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://queure.ru/uplcv?utm_term=apk+live+football+tv+streaming+hd PDF link annotation
    • http://termocity.by/pics/files/sajubum.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614e3dc83ad78---12215661104.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/901931562.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/84286319964.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/4413805540.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/74134194484.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/54961404364.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/8499580283.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/wiluzupisakitoj.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148013b73dcf---vusegirekunotes.pdfIn PDF document text
    • http://onelove.cz/file/86049853453.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/61344988911.pdfIn PDF document text
    • http://www.77ice.com/upload/files/takajipa.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/22472752719.pdfIn PDF document text
    • http://ruresept.ru/files/file/pexajekusiza.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/91329966214.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/98212565219.pdfIn PDF document text
    • http://canissapiens.com/images/uploads/file/fekegakexepevazezorukum.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/kotabowake.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/jogugovazalumanonaro.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210904125734.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/xatexoburogusuren.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/44189472577.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_off0000b2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C5 11224 bytes
SHA-256: 5a6b6eb8bccc86c149c6e295723f26518a84745dfab9971d88c54bb89d6fb09f
font_01_sfnt_off0000cc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48D 18416 bytes
SHA-256: 00c2aee112e7c60ff63a022397fa259ffb0eaa98997f1597f5ea8f39e8c8e58a

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