Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dfcb077cbe87b09…

MALICIOUS

PDF

74.2 KB Created: 2021-09-14 10:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 60de36f675eb83fbaef70882bdb79233 SHA-1: eeee34a816e64bd04f18cda85777ce6d2a983c19 SHA-256: 1dfcb077cbe87b09fb52ee26376ced468b19c82d99c2fd81f64339402a7654cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to numerous external PDF files. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest an attempt to redirect users to potentially malicious content, aligning with phishing or malware distribution tactics. No scripts were extracted, but the overall structure points to a malicious document delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://dsfly.com/uploads/files/nodozapasa.pdf In PDF document text
    • http://okfilm.kr/userData/board/file/63701839700.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/91597582502.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/vekunikep.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/94409668734.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090222571773499.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/woderisujidejogi.pdfIn PDF document text
    • https://seikai.jp/free_images/files/32825926187.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/gapupapurux.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/18807186215.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/sozosixarefalubibizu.pdfIn PDF document text
    • http://arucax.am/user_images/file/bovesag.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/35590070847.pdfIn PDF document text
    • http://forspeed.cz/ckfinder/userfiles/files/21854513260.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109131200349422.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/161300bb703f88---49711367464.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/wowenuzexirawoxa.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/1524951670.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/mikulozozowijuz.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbda539143---35721983134.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/09/20210902062155.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/sozopo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=www1+watchfilmy+com+watch+bollywood+movies+2020+online+freePDF 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_off0000bd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD6D 16536 bytes
SHA-256: d97d736362197996718f6ff95f9aaa5510c4080cc6fb2f7a1843d7db05d676b7
font_01_sfnt_off0000e7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A3 11436 bytes
SHA-256: 5b17fc3b8919d3646e3cbb1d4a857746c1c496ffe5ac9ddbb520973b0dc309f3
font_02_sfnt_off0001029d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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