Malicious PDF — malware analysis report

Static analysis result for SHA-256 2688d826074d7967…

MALICIOUS

PDF

91.7 KB Created: 2021-09-11 04:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b86e6329f65974b208bfc0bfb922dda2 SHA-1: 726a930af18fba0d30412b0ecf5d0057b9a615ec SHA-256: 2688d826074d7967e1846901ba6c96fc22b1f153085dcf3377806647a2d30284
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it's a link farm on disposable hosting. The embedded URLs, despite some being marked benign, point to a pattern of redirecting users to potentially malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4905b255a---73086815702.pdf In PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/fimudebinelaril.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/metavopifefefezukazi.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/fagidapalale.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/25315797863.pdfIn PDF document text
    • https://safarekhoob.ir/basefile/safarekhoobir/files/guperavujoreloxag.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/68205063788.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/22438036328.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/63835566761.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/xiduz.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/e3d2fc90e3cad25f42b09305c109f7f1/97472421035.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/53438556912.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/pasakomiruburunuxenudoz.pdfIn PDF document text
    • http://norservis.info/files/files/28194256133.pdfIn PDF document text
    • http://vititanon.com/user_img/files/lefedetovafexizo.pdfIn PDF document text
    • http://xfswchem.com/upload/files/70445148746.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/lomovasulibutemujogo.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/34152768018.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/59419123040.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/zeruwonepebowananodujaru.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/vivakogevozubuwazudet.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/83352553111.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=after+2019+full+movie+free+onlinePDF 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_off000103b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B4 17228 bytes
SHA-256: 562c9f55953e6583ecaa7c7d8ba0280d830554e2299649f2b474092a03142707
font_01_sfnt_off00013068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13068 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001487f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1487F 10656 bytes
SHA-256: 2f739c836fbee7fa1a22ebba769caad732af349249e6116bcd89d3253dc8ef12

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