Malicious PDF — malware analysis report

Static analysis result for SHA-256 abce19f5358436b7…

MALICIOUS

PDF

83.3 KB Created: 2021-09-20 19:19:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: edd93f135af80d724e88c1eb3f44de74 SHA-1: 94ed2ec09ead86f7788f7aa3eadd6c0020a53a27 SHA-256: abce19f5358436b78e9e2b9027607976de519195c9fe6ea7345902d528ad8a75
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to obscure the final destination. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM indicates a deliberate attempt to use the PDF format for malicious redirection.

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 http://daiichibus.vn/uploads/news_file/62475816604.pdf In PDF document text
    • https://bestrecycledautoparts.net/images_i/file/xomakudiruvakukorozimeser.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/98423456181.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/lovugufeveba.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/sujojeme.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/nibujajel.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/firisivimesinonitigi.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/61931819495.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/4250537299.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/64669061891.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/13871740653.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/xifowomubujo.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/kakimezuminudikufu.pdfIn PDF document text
    • https://maviet.vn/upload/files/kukiboxudikeleba.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/60050374973.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/voxasakowul.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/af04f60911585217f5fa51274186e507/37420729729.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/56025675333.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/36763199438.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/lokusaviri.pdfIn PDF document text
    • https://sibirprokat.ru/ckfinder/userfiles/files/9329352877.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/161343bae17bdc---perorawalapegamazelujut.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/71906301107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=create+system+reserved+partition+windows+10+diskpartPDF 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_off0000df54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF54 11072 bytes
SHA-256: f061cd2da8e268ef3094070d4451210fbb76dc1497829346f51d16714d09983e
font_01_sfnt_off0000f941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF941 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11153 17900 bytes
SHA-256: 551d22d3a62ea8b3a42f1dd8b9ddc4a8d422645f446b46d3d263582e52e10ab3

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