Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a8f2dcba86d4939…

MALICIOUS

PDF

89.4 KB Created: 2021-09-21 02:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 48fe5e4aede93a9c6a0b5d25f54cf152 SHA-1: 1d3d918cfca360336fe3c0f73951b3028a89dfea SHA-256: 0a8f2dcba86d49394fbc82b0a5921c6029391d151890a6b1b7ea8fef51188ed0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially harmful websites. The PDF structure and the presence of external links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dalaichau.com/files/zefexu.pdf In PDF document text
    • http://xsjsbzrw.com/uploads/files/wesovefukikejitolebug.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/jipimipobawumod.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/31133168467.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/40518601447.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da070ae7d9---4390891204.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/63749866109.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/89455444301.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/walibogirumunoroguvarol.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/tisifizosogutuseperebe.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/seloderanolakefobemafup.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/61405525683.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/25129060118.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/rufadegikij.pdfIn PDF document text
    • https://photojet.net/userfiles/file/naxuluvunitapewu.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/20354704815.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/zuwigibezulalevo.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/29570735963.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/30696584271.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/97144272139.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/rukuwajosudebifebakexuduz.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/1782976561.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/panemevevuzegoje.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/62588885697.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/nafowekolefunuto.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/likifutirolozagefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=telugu+songs+download+for+android+mobilePDF 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_off0000f4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDB 19160 bytes
SHA-256: 16c7f2a92bebda82c46e95ad20026e90cac9db96ea9f3d79751b1f6930a496b6
font_02_sfnt_off00013e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E52 10888 bytes
SHA-256: b8a1f65901090c37e642b9de8df839cab2fa98a511d59dc0415fcf45f7f0d35c