Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0a22492c43312c6…

MALICIOUS

PDF

94.0 KB Created: 2021-09-12 04:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e95d18487714a9798c5d3efe401083e9 SHA-1: 536ddc70e25c05e6f398dd6e338c8890319c3d58 SHA-256: f0a22492c43312c6ba572551988ecdbc2c79746a7b9cd921e6e1dc6bae431ae3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://thevisionkharj.com/userfiles/files/pojaraxeba.pdf In PDF document text
    • http://csc0851.com/userfiles/file/20210911095929_ik882n.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339c0dc110c---mumufejifu.pdfIn PDF document text
    • http://sdsenlex.com/upload/files/buterixu.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/66430055910.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/42328106723.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/33003427132.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/97261518109.pdfIn PDF document text
    • http://rld-carbon.com/file/40758610284.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/fijajuposexajijoxunulavop.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/fizazasodatukoruxawuvi.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210906032714.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa782a035c---18353903859.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/41997731295.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/dowiwase.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/lerowu.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/6510545270.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/xibug.pdfIn PDF document text
    • http://haphadoor.com/upload/files/67901286632.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/25673002532.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/javukosefagajomok.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/11143742400.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/23329225177.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=apk+gta+5+skip+verificationPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE583 20540 bytes
SHA-256: 9a22d30265aa3e5348eeeacf87dbbd78c2f10dca355ea9f38d60879ef9e75a19
font_01_sfnt_off00011b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3F 10884 bytes
SHA-256: fc23ebae6adcdf0050db07667ea8e6b379161fd7fd9542dea3cfa91cafe9860b
font_02_sfnt_off000134b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B4 18520 bytes
SHA-256: 47bf4cc353bd26922f99394da734135d651992a8c9fe6e88576b23654a645e45
font_03_sfnt_off000151cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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