Malicious PDF — malware analysis report

Static analysis result for SHA-256 f16aad6592b80f1c…

MALICIOUS

PDF

88.8 KB Created: 2021-09-13 10:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 162d4691c07fe0f95f82f9a930269e01 SHA-1: 31777fed54bb64949e93bb7303ad47e271cc1c2b SHA-256: f16aad6592b80f1c74f05d978107b7ba673b05375383d87c9f206b84f203a01c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of link farms or hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URI heuristics further supports the redirection to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://archism.ru/uplcv?utm_term=uppena+movie+online+watch+free+in+telugu PDF link annotation
    • http://jafra-com.at/userfiles/file/32520943947.pdfIn PDF document text
    • http://czyxchem.com/upload/files/79645146532.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/25907759087.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131721e7a013---nizigatipugibuvagifunuwi.pdfIn PDF document text
    • http://jawarakreasi.com/file/ninavubabas.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/waxotuxalogadob.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/17698473680.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/10230764133.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/71131484880.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/53243450607.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/3427520169.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/fijozogima.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/kezadozemogewatasipuvi.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/77059744476.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/peketojiwetozelixawagen.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/wareduw.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/tebamukidowenid.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/4869741949.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/43556607878.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/tulujepamikumiluxuregul.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/23755166833.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b880c00ae2---guresovinisuj.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87745571302.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/72920977292.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/19411299003.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/64397264350.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/09/20210909065536.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_off0000f6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F10 17596 bytes
SHA-256: a8bc317a8680d05d514ca1f4c666c93042842ab7a56b1283ac446b2cfb2f81be
font_02_sfnt_off00013c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C45 11020 bytes
SHA-256: 5edc4aef014029f87d955535bb56c0fc2cc0a3c55d2f1efe18e0bede05c55a4c