Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5b1360eed8eefda…

MALICIOUS

PDF

69.3 KB Created: 2021-09-13 22:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: 844f522873dbd6d9d9f548a95c4fdd10 SHA-1: 0d66e6ced6d31368fcc8b6524d8176139b9de7de SHA-256: e5b1360eed8eefdacadf97e5b3795ba868a015bb52812a83a5894d415899e6d2
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 http://alwaysshine.com/fileimage/file/zokukusa.pdf In PDF document text
    • http://kiiga.ru/userfiles/file/7828505384.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/6704307446.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613f66716af87---3152380226.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/81859631507.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/72668188321.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/wejatudosisowedat.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/58954505275.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/60973503383.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/16450162668.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/84927913939.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/94425960203.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210910_6ECD945F78653356.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/dawesiguxitokan.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/55604363329.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/jinoxi.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/mawugagegem.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/zixekumebufepagarimuzi.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161378b238cd3a---rutifoponifijamore.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/likasijeb.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/38923913871.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/38519039954.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/gebaxudumamosarexin.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/fasebikixenovit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=can+i+download+itunes+on+androidPDF 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_off0000b2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAEE 10456 bytes
SHA-256: 1243644c4b7bba58233349b5b5a47f201785bd7d1ba68a570f6eccd995385acc
font_02_sfnt_off0000e2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DC 14520 bytes
SHA-256: 852d2b48a3f5bb428cacdac6d43e4d740dbcaad655438560c24206629f846608