Malicious PDF — malware analysis report

Static analysis result for SHA-256 992bcfe1e53f9eb7…

MALICIOUS

PDF

81.0 KB Created: 2021-09-13 01:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2c610276d879dbeb21bf02526a665b9c SHA-1: f319be8f62abb94f52f870721387a172fba509df SHA-256: 992bcfe1e53f9eb7d3634e19b2e892946897dad7e31ad912e2bd2d7382a4f104
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to numerous external URLs, one of which is `https://huntic.ru/uplcv?utm_term=sport+live+apk+download`. The document's structure and embedded links suggest an attempt to deceive users into visiting potentially harmful sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=sport+live+apk+download PDF link annotation
    • https://proektasis.gr/admin/spaw2/uploads/files/9941196101.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109130521432989.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-01/images/files/sofazemijaw.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210907184825_2078198845.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/famabu.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/fuxevazi.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed8147c0b0---55394567016.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/jisaweselibodekiweka.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/6710823474.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/zomubodeduv.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/fidipune.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/36914818523.pdfIn PDF document text
    • http://sbairs.com/datas/files/jusekebebikotasen.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/71670730075.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/nuxafusovitobodifefeb.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/sojiwunevavifuparuvo.pdfIn PDF document text
    • http://ciskmv.com/css/file/sazozoxisufotababamupe.pdfIn PDF document text
    • http://infracsap.hu/files/file/24848400265.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/nujolataviluwu.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/97864925065.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/xoberiwupugegix.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/17142440350.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109050412513955.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_off0000d768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD768 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7A 18256 bytes
SHA-256: 77c3a7eb013a4a32ad706a232d4cf57fe8f07feb1c1778ba39040639e17a81d7
font_02_sfnt_off00011eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB9 10536 bytes
SHA-256: f8226ca252dcb286f0ab5d8ebcdcd236c62e4db3e83a39704dc30faa41a7a999