Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceed3ac547a39cd8…

MALICIOUS

PDF

87.2 KB Created: 2021-09-19 04:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 363ae579a75eed26e5aed9ee32da6745 SHA-1: 7098f80ad217ef5582225bcfa08ebc34ece2ab10 SHA-256: ceed3ac547a39cd8eb44928050337dcb4a646639709db6f431b45c5360daaded
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The PDF structure and the presence of JavaScript point towards an attack pattern involving the exploitation of PDF vulnerabilities to execute scripts and lead users to phishing or malware hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inbeeldt.nl/userfiles/file/zozakiwexenipep.pdf In PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/59394260225.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/55895518641.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/10263335671.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/xogevegi.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/koduwufopilorovejeguru.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/34037672.pdfIn PDF document text
    • https://kawanmto.info/contents/files/bivokuxudenuvezirebefenuz.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jitejenafimimadenuwiguwaf.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/bagigikizozawilujakobuz.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/99954968785.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/ramazaligixalozigiketodod.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/luvexonusuxaneguw.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/gefitawibew.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/16336047281.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/durumajunidikidibuvu.pdfIn PDF document text
    • http://pasaru.com/upload/files/sasowuzopudenakapikig.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/7974580958.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/78352608554.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/52449388534.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/8fd228af664af89aac48a4dece5b5be3/87345375136.pdfIn PDF document text
    • https://harley.dataroom.tw/upload/files/vefasisagugumis.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/kumeze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=money+lover+expense+managerPDF 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_off0000ee49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001065b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065B 18480 bytes
SHA-256: 460e9cb9cd7d2bf45acb19eb7ab20587157557249c2df967112846371a91b1a0
font_02_sfnt_off000136ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136AE 10680 bytes
SHA-256: 67c1fd12e36c7dc66f822019c842512f3b7b4e9bb3d812690c18f5b3615eec5e