Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c4856f49fc060e…

MALICIOUS

PDF

70.0 KB Created: 2021-10-04 00:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e631a9c15db11274c2a6a562a2cddb3e SHA-1: 157f7dc68e031d9810d6b1cf3db194bdb11a533c SHA-256: a1c4856f49fc060e4e1428a73fe87a2fbfb5fb6b1a71ae10a1b9849a1e6ae2e7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs, many pointing to disposable hosting, suggesting it functions as a link farm. The primary URL, 'https://smidgel.ru/uplcv?utm_term=jarvis+ui+klwp+theme+apk+free+download', indicates a lure for potentially malicious software downloads. No scripts were extracted, but the PDF structure and numerous links suggest an attempt to redirect users to malicious content or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://smidgel.ru/uplcv?utm_term=jarvis+ui+klwp+theme+apk+free+download PDF link annotation
    • http://hide-bo.com/img/tmp/file/95181784122.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/tusabex.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/65941094663.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/62331741892.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161457084ee9b8---tojigasuselenujow.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/gigetonozuf.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/2628928438.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210907145921113.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/30248111311.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/dajexabifojamibegurazive.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/kupazajim.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210923140535.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/58519317720.pdfIn PDF document text
    • http://recviem.ru/img/upload/56941444777.pdfIn PDF document text
    • http://fpole.ru/sadm_files/86511238572.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161351344d2a44---11849997853.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/68173135021.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/53042405069.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/82259050973.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/62511173831.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/dorak.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/24508352326.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/zavobavepidivesuz.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_off0000af75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF75 16268 bytes
SHA-256: 7fe4e5691c3c4be3bae8d8571bce3c65bd9ebab3a36f1a4bddddb42d72dcfedb
font_01_sfnt_off0000d8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BF 11096 bytes
SHA-256: 3868af0eb21af7d1bfc9bb51c2d6f4374525fd4fea77ecd872d5ab6c61b5ed41

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