Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b627c8bb6f81e00…

MALICIOUS

PDF

86.3 KB Created: 2021-09-09 20:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 475f7c63d0ffcb845861ecd2a9678d02 SHA-1: 64523c02a39aa8b64cb45a21ea808d2a1adf9c53 SHA-256: 0b627c8bb6f81e008e3a74fbee8429a1fbdee9213f0bc0d8db3a21e0d2083aea
134 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, many pointing to disposable domains, and exhibits characteristics of a link farm designed to redirect users. The presence of external URI heuristics and the PDF_SEO_DISPOSABLE_LINK_FARM rule further support a malicious intent to distribute or phish.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://altaitur.com/ckfinder/userfiles/files/torola.pdf In PDF document text
    • https://pharma-tools.eu/galeria/file/38205668806.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/wuzofamemonifisigefet.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109050756098965.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/valugamu.pdfIn PDF document text
    • http://trevorhannant.com/fifatapevafojiwamupisive.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/fuduzezerorinaj.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/kadet.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/izisa.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/bibugedu.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/43004540914.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/wovorux.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/19131471928.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/tebaxaposimipafa.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/93209089581.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/75921873551.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210901073708.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/51609031893.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/bewisofikewobil.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/4897449514.pdfIn PDF document text
    • https://digireg.at/upload/wujefi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=kick+the+buddy+full+apkPDF 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_off0000ea09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001021b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021B 18948 bytes
SHA-256: af9a577d432c192ae9082950bd6f2d5a7662b925ac12c402686c64f1022e35e6
font_02_sfnt_off00013353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13353 10660 bytes
SHA-256: 824bd46fcd6c4980f2f7d20fd862798681a2ff5a56187ecc1ccaaad10ecc5069

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