Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0f629fdcccffebe…

MALICIOUS

PDF

78.1 KB Created: 2021-09-23 04:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 54a1d49f7f87b3d01d0b755eadc59c6f SHA-1: a797bea40e7c72fe36162fe401a5003ded0ed4c7 SHA-256: a0f629fdcccffebefbb0661b19015b64e02a196c0cae59eaf72e46ed1c4813b3
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. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to potentially disposable hosting sites, suggesting a tactic to obscure malicious destinations. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://krishnacock.com/userfiles/file/sojogevatosasuxafinudusi.pdf In PDF document text
    • https://iphone-odklep.si/vsebina/84664500491.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/10246948920.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/viwibupeba.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021091017514373499.pdfIn PDF document text
    • http://checopharma.com/upload/files/19575788325.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/015994b27d98eebe056abfab75dbbd5d/wolakibaguzenuv.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/9781548600.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/potud.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/tjm0nlpq3lupnjfdq1bojp5v44/41224463930.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/roluwal.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/wepove.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/rosemovefetegulezepofol.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/gipavatoxoj.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/govisidajaxeje.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/keviwosawak.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/vogujot.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/fasijozemiwomatewug.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/32253724733.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/resokatob.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/97365133798.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=hands+on+learner+meaningPDF 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_off0000cd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD72 10484 bytes
SHA-256: 8468255c0f530b192832fff0f708b4a6e2e97dde510a7321b4d1ce0ce8aa9fa5
font_01_sfnt_off0000e4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFC 17760 bytes
SHA-256: f9bfcbe167ae10ef88d83dad5e2c0230d53150870758086220d066135b2f1cc1

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