Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3876f79e9a1b0e7…

MALICIOUS

PDF

84.8 KB Created: 2021-09-16 20:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dc9b1e108184a16a62ce93a209f054d6 SHA-1: dc0fa3510795ac1a8d09b72b947d952691dd0cb5 SHA-256: d3876f79e9a1b0e7df295a26f5176d38c9cad46f14905b7f4fc4502c1dee58a0
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious content. The document body is heavily obfuscated, suggesting an attempt to hide its true purpose, which is likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://izumrud38.com/ckfinder/userfiles/files/29713054431.pdf In PDF document text
    • http://mobitransjogja.com/files/97985007913.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/sesemapuwuxenezagexux.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/seridajudepi.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/zemonetobiwavujixifuludox.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/tibowab.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210916_900CC6C33D12AD3D.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/74574702436.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/68728787809.pdfIn PDF document text
    • https://superchills.com/userfiles/file/96057683777.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/11020543801.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/lirenulutokovagazedi.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/gujefemezigo.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/pusez.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/2099579348.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345b64aafdb---60190229755.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/zexoperamivopiredorit.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/mapusezasepenimonixil.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/75314761875.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/warokawawezu.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7238b1962---bofajum.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/fimexisebuxunoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=button+button+short+story+pdfPDF 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_off0000e6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C2 10568 bytes
SHA-256: 15fa90339b21919d330f4c84388ceaa7211893e455b752ff67e5d8603ef1322c
font_01_sfnt_off0000fe9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9E 18232 bytes
SHA-256: 2203d5a47a9b0d9ddf1851d7e3cb334beae19ae305e99dae3f2ccc86279e7a60
font_02_sfnt_off00012d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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