Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a360101939ea0ab…

MALICIOUS

PDF

84.0 KB Created: 2021-09-12 10:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 91de14f1d8344b49920979993ef3479d SHA-1: ee85fe3feb8e9030eb2c3f73c67c1d6ceeb6ea62 SHA-256: 9a360101939ea0ab3e88d0f3e7e849158ccd5cbe3f81315d5c38cb250def2863
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of link farms on disposable hosting, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the malicious intent through numerous redirects and varied hosting. No scripts were extracted, but the overall structure and URL patterns point to a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://garglob.ru/uplcv?utm_term=the+walking+dead+no+man%27s+land+download PDF link annotation
    • https://zivotzaokny.eu/res/file/58794623398.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/nijapoledawaludomel.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/8185083141.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/woweror.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/baxasa.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/xajelajoseji.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/83750696326.pdfIn PDF document text
    • http://stefani.cz/fck/file/fagomuv.pdfIn PDF document text
    • https://dacola.com/upload/files/dagetotuniwokibalavosim.pdfIn PDF document text
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210908185827.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/bitotoxubivojaludure.pdfIn PDF document text
    • https://ises.smithpressautomation.com/phpsites/vertical_living/uploads/file/38353338571.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/komakikowabobo.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64859000281.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/newulinumutefikeluzovet.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/41221283849.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133bf8c876d8---rotupo.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/rekojoweparikuruwedupo.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/lejilaferakadevazuligate.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/37037006100.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/75737536364.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/93602740105.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_off0000e479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE479 17580 bytes
SHA-256: bfdeddc88b59bbf54b475fa0e41dc26badf63120097a71ffa88c7989cf3ec16d
font_01_sfnt_off0001121c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A33 10672 bytes
SHA-256: b86d160317bde8ad7898178b827f03b6dd2c98659a327abf043259c349d69211