Malicious PDF — malware analysis report

Static analysis result for SHA-256 8114ebb7e3db1b79…

MALICIOUS

PDF

70.7 KB Created: 2021-10-01 08:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1238ff4b95f712f7b94e1013392a9a1e SHA-1: 87802fa37db0ae8b00884d5fc1516345b2fb4c47 SHA-256: 8114ebb7e3db1b798f2832bdfcac7be8521b90c94fb047be1859ea0ced31e493
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further payloads or conducting phishing operations. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=bettina+love+we+want+to+do+more+than+survive+pdf PDF link annotation
    • http://globalbando.com/DATA/upload/files/202109230917377163.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/61096058120.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/33369883418.pdfIn PDF document text
    • http://spineportal.de/files/file/67127980144.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b500ac10d1---13623497011.pdfIn PDF document text
    • https://kawinlari.com/contents/files/83003101350.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/41200909763.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109101947099778.pdfIn PDF document text
    • http://all-premium.com/user_file/files/15778582627.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021091809454044.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/96318917084.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/43228866406.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/f0c135cda56b5ccd13680439b6a8fe2a/59780153062.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/guzikojod.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/67591303574.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/kukeretisumazizevofa.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/18724452281.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/29853689334.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/zoxopapisaxozuxivojo.pdfIn PDF document text
    • http://ambartakip.net/belgeler/file/neludodere.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/12316272870.pdfIn PDF document text
    • https://interno-kazan.ru/upload/files/17155797311.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/3372632422.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/19316592320.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_off0000b2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E5 11068 bytes
SHA-256: 1c0846b26d53f5f5978d3313739da664cfc65c4fa6b1d18ce561c72b5343e93b
font_01_sfnt_off0000cc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC84 15748 bytes
SHA-256: bd5940889b40c03bbb9528ae563c0729f90d58ea30716162a63c1bd349927a04
font_02_sfnt_off0000f492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF492 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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