Malicious PDF — malware analysis report

Static analysis result for SHA-256 e571d7a8fb7d9d5f…

MALICIOUS

PDF

67.8 KB Created: 2021-09-27 12:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f280a8818345bf65f5d24402d67ad09d SHA-1: 18258907cbf6741451f8c1d7108e57234a6f66b9 SHA-256: e571d7a8fb7d9d5f4973010206030807771a39b0ee01cabebd35e48a6de9c3e9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. The embedded URLs and the PDF structure suggest an attempt to redirect users to potentially malicious sites, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous external links points to a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://chcial.ru/uplcv?utm_term=online+tamil+word+doc+viewer
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/tuxafipu.pdf
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/71292304793.pdf
    • http://loveperfectionschool.com/upload/file/26848356652.pdf
    • https://aspit.ro/imagini_ws/96401161381.pdf
    • https://szaniterplaza.hu/ckfinder/userfiles/files/bozogidojomixobu.pdf
    • https://eklyps.net/images/file/54555348197.pdf
    • http://rowerowaszkola.pl/imgturysta/files/83956249003.pdf
    • http://mkconline.com/landmark/ckfinder/userfiles/files/tonufusaludozudefebev.pdf
    • http://drapa-technika.cz/UserFiles/File/8797793614.pdf
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/46001137678.pdf
    • http://kronospan-mofa-hungary.hu/editor_up/wujeresegi.pdf
    • https://agros.net/uploads/file/41045809577.pdf
    • http://greenld.com/userfiles/2914498069.pdf
    • https://finliz.lt/i/File/nenosititapanotizevazivu.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/7463aeb75b857b9f41db555abf2f2d19/xijazeroka.pdf
    • http://slkuang.com/v15/Upload/file/20219201312282596.pdf
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/dulajodarudotip.pdf
    • http://stillincontact.com/images/mails/file/dekesegamafixena.pdf
    • https://at1-turbo-j3t.com/contents/files/54344133072.pdf
    • https://bor-diing.com/upload/files/66131546508.pdf
    • https://corcreation.twbiz.me/data/fckeditor/files/20210908_225905.pdf
    • https://espiber.cl/images/uploadedimages/file/bijasaki.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000abac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABAC 16792 bytes
font_01_sfnt_off0000c3be.bin
c74c76d0ed5ded99fbef659f1918946b7cf9d502c605783eed5145716aef2279		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3BE 14664 bytes
font_02_sfnt_off0000e865.bin
4d7d9a7ea822c8ee0999c2389709ed5d733955d342cf95e0dfe0b91a65211d32		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE865 10540 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.