Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa5993a92ac1ffc8…

MALICIOUS

PDF

88.2 KB Created: 2021-09-19 19:37:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e44dbbc9164dcdef6d31165a70f32496 SHA-1: 7bfa6b2688319fcd6bfbdcf7590a9f1239e5551c SHA-256: fa5993a92ac1ffc88626357a7ff3cd5ecf5a439478ce1376d657370f16f52427
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates it is part of a link farm designed to obscure the true destination. The embedded URLs, while many are benign, point to a pattern of hosting numerous PDF files, suggesting a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://modernplating.com/userfiles/file/58151881478.pdf In PDF document text
    • http://finalbrand.cz/upload/file/tebovivij.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/xilosoxod.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/95081365351.pdfIn PDF document text
    • https://matratva.in/userfiles/file/31666156754.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/zetevunibabodemagewa.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/10439142701.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/zafolitamizino.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/didimivoruzorajifatiso.pdfIn PDF document text
    • https://badoza.net/userfiles/file/lukerizekogivimen.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/11660909073.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/dulugesuxovupowarajan.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///34847014679.pdfIn PDF document text
    • http://accutindustry.com/Upload/files/20210916143134.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/duzoroxu.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/zetepigisava.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/tusezibubus.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/77343973886.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///11429914391.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/80382292316.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/46809666780.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/petonisolowe.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/161396c61b2ad0---82542808545.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614682629df70---giwefavunamegibub.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/4494644427.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/95436341501.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+make+my+face+emoji+on+androidPDF 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_off0000ed5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5E 20328 bytes
SHA-256: 5da077774ea0c1d2c33d4fe21bf694a8047216e7f1fb5b0516ecc76ecf6307d9
font_01_sfnt_off00012225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12225 10836 bytes
SHA-256: ac341b509f1f75e40c5128cf61988650390a2a1c18d851427edd905942d73856
font_02_sfnt_off00013b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1