Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a49ba762b4cb3ac…

MALICIOUS

PDF

74.3 KB Created: 2021-09-21 04:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6095ca1570dccbcb87669654deaedcd1 SHA-1: b8b946938f9cb1fd359f7edab85a424757526838 SHA-256: 8a49ba762b4cb3acd4bb4b497a6a000db71d31c34ab62c69baa7083f24903d2a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external domains, many of which appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to distribute or phish via these links. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=android+on+hd2 PDF link annotation
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/53814589787.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/guloguk.pdfIn PDF document text
    • http://dr-temt.ru/images/file/61073996449.pdfIn PDF document text
    • https://ngenadmin2.nextgenphotosolutions-beta.com/app/webroot/files/file/sijebonejekuzimupevas.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/18830518126.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/360223738b59f25708dc9296309838cb/salogupigimufonizabasudu.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/88443697684.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd75dda5be---xilerogufesimubegijurona.pdfIn PDF document text
    • https://raljob.com/userfiles/file/patukewaxim.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/sipofulalevetanexuxuv.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/10697936230.pdfIn PDF document text
    • http://litroshaber.net/resimler/files/lidegawino.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/23730898592.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/10295721338.pdfIn PDF document text
    • http://unsersohn.com/images/file/93443985354.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/kopedisakaxawazamukokelen.pdfIn PDF document text
    • http://ymmicro.com/files/files/90054171997.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/27875096536.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/dizakejoladita.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/18659423512.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/bexezotekosar.pdfIn PDF document text
    • http://simoncaulkin.com/images/39647394814.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_off0000bb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38F 9840 bytes
SHA-256: 5098363c822896ecba212e9705cbd49194d04886307efc43313af52121334f01
font_02_sfnt_off0000e905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE905 19752 bytes
SHA-256: 997c8cd83701627b1b79a87d179a7f47c0b971bad5ede3608a3fd40f0e873618

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