Malicious PDF — malware analysis report

Static analysis result for SHA-256 8504dd7cf2d4f8d8…

MALICIOUS

PDF

71.7 KB Created: 2021-09-28 06:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f48a69c9558e060499243a91ed35bbf2 SHA-1: e0065508a227b0c7893e118346e575d52aec1c84 SHA-256: 8504dd7cf2d4f8d857733f29d7041c8e037e6e2899af4cc16bd4022f8d1389e2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains. The presence of embedded URLs and the nature of the heuristics strongly suggest an intent to redirect users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=android+gpx+tracker PDF link annotation
    • http://erdbau-rauch.at/kopoxojowufogoxebirav.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/82123154302.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/vikevor.pdfIn PDF document text
    • https://spyboarcams.com/files/28734326745.pdfIn PDF document text
    • https://shevian.com/images/file/7666812973.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/55858819746.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/zoxivasomololem.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/tumagajemazovuxuj.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/pasilujofuduzozur.pdfIn PDF document text
    • http://dominant.name/userfiles/file/dawajatuminudu.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/wopajudup.pdfIn PDF document text
    • http://pk.mo/userfiles/file/24732444952.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/6058a4d9ca9ef2f3e60b5fb8cc43e9fa/rorojimopepirefon.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109190522535239.pdfIn PDF document text
    • http://espicycooking.com/files/file///suruwivifipiz.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/wipevoliluro.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///wufazekuvopizinelur.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/59070025151.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/xakatizawulerinuka.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/xikamag.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/vabamapogirisukibo.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/74183949522.pdfIn PDF document text
    • http://woykoff.hu/upload/file/moxebibar.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/jexuwo.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_off0000b3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3ED 10652 bytes
SHA-256: 23789c5e7cded48d4f4857354d7fa77abded3b59c42f9bd3fe6bca766b05e3a0
font_01_sfnt_off0000cc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE458 17372 bytes
SHA-256: 79673c0038d76290791d1bc36f9183caff2cf2d456ccf579a350a0de15416dad

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