Malicious PDF — malware analysis report

Static analysis result for SHA-256 abcd2b7ec2755e98…

MALICIOUS

PDF

70.4 KB Created: 2021-09-27 16:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 354a06b808efe7df3e2370b28f4d9c7b SHA-1: b2be6bd8898e2d2bcf04ec79b3ae703d7645b1fe SHA-256: abcd2b7ec2755e98780689ffc3cbd35bcdea676f99d99c39e40bf7bbe0ddbdbb
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple embedded URIs, with one directly pointing to an IP address, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the presence of multiple external links and the PDF structure suggest an attempt to exploit vulnerabilities or trick the user into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://nbc.com.vn/ckfinder/userfiles/files/suzatitazisigaz.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ce7c7a6e7---wiviwopukogufadewupilepu.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/fanategomebafava.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/38751038534.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/sinok.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/63110887523.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614305fc808a7---gomejofulurifexu.pdfIn PDF document text
    • http://bienbao.net/uploads/files/xubunivage.pdfIn PDF document text
    • https://1000families.eu/userfiles/file/wisamiwodivaxepew.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/saxisetepibogubub.pdfIn PDF document text
    • https://www.miotsukushi.or.jp/system/ckfinder/userfiles/files/14645790869.pdfIn PDF document text
    • https://suncables.co/images/file/jumabifawabilelonoga.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/kakenoxovimajalo.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/74621438499.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/soled.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/13002255112.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/88158208546.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/xubapa.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/63412683774.pdfIn PDF document text
    • https://foodbiz.bdata.link/upload/files/guzagubegi.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/52355974552.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/25447193085.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/33642792263.pdfPDF link annotation
    • http://guowangcable.com/d/files/82267325094.pdfIn PDF document text
    • https://kokomanis.com/contents/files/48478154385.pdfIn PDF document text
    • https://cncunse.com/d/files/47246517854.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=addictive+games+offlinePDF 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_off0000b40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB40C 15576 bytes
SHA-256: 3a64926992a4c7508d4d51657557525ba8c00603f29cad9b451065db192c45ab
font_01_sfnt_off0000db41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB41 10764 bytes
SHA-256: 19d97d6eace2e026030e1096729b6d382c4b53612273060360507dcaa2bea8d4
font_02_sfnt_off0000f3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1