Malicious PDF — malware analysis report

Static analysis result for SHA-256 74f5ac72f04ce7b8…

MALICIOUS

PDF

85.8 KB Created: 2021-09-17 17:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6a9a0966e120119536adfd7c028a28ae SHA-1: 99952d3fa399e26ed2231d92b195cb5ef8d3db78 SHA-256: 74f5ac72f04ce7b8f34d937c8af859456a8f4eede08d2e8bb0ac8fb9dbd783e8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent, as it identifies the PDF as a non-clustered link farm on disposable hosting. No scripts were extracted, but the presence of external URIs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://cructi.ru/uplcv?utm_term=screen+stream+mirroring+pro+apk+gratis PDF link annotation
    • https://groupunsur2.com/contents/files/jefomuzejelilu.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/pufigadaxuji.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/jibugawamodoxo.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/45298535874.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/38444847576.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/jewavopibisujakewuwukew.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/gipasale.pdfIn PDF document text
    • https://eslms.com/userfiles/file/34871631809.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/22572681089.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/waxaguzuruwusarimusav.pdfIn PDF document text
    • http://industrialdevices.in/uploads/43459176749.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134892e261bd---76799653555.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/suzukegi.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/57294971391.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/26417296320.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210905163555_km99bs.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/7140ae7d7811b5154d08c352d283249b/jisazogi.pdfIn PDF document text
    • https://webhosting4.net/media/file/disowotomo.pdfIn PDF document text
    • http://spynet.gr/Administrator/uploads/userpics/OutPostImages/files/98046791368.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109101823472803.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/36080197162.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/dubepepero.pdfIn PDF document text
    • http://esipro.be/userfiles/file/tugifusozivuresi.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109112130293982.pdfIn PDF document text
    • https://27061010.com/uploads/files/202109100007552939.pdfIn PDF document text
    • https://eventaipei.com/upload/files/wumomuli.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_off0000e203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE203 10840 bytes
SHA-256: ffbade392f7087c92e39455126ec09931d66bbf21bb2f349f997e99d21bd5c62
font_01_sfnt_off0000fb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001131c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131C 20448 bytes
SHA-256: df9db10cb95dab58fc625a5833c7d4d953c838dccbffa5be51c248dade88679e