Malicious PDF — malware analysis report

Static analysis result for SHA-256 76e6a8db44c31c73…

MALICIOUS

PDF

81.1 KB Created: 2021-09-12 17:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 685f33ce631785110a2cb264bee13e2b SHA-1: 8179a6a518d7f88f16a878676d435ca20feeb4bd SHA-256: 76e6a8db44c31c7346d68b6def60ffd2c1523b97b8c8ff3d609f91ae118bde21
146 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many of which are part of a link farm hosted on disposable domains and IP addresses. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malicious content. The presence of multiple suspicious URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://cructi.ru/uplcv?utm_term=fancy+key+pro+apk PDF link annotation
    • http://epodhajska.eu/UserFiles/File/xomemesigeme.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/nuxinabebawirututawepufil.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/7297248577.pdfPDF link annotation
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138984796bd3---64249555302.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/14309063172.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/bifirijutexufarifof.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/54473028019.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/31032640180.pdfIn PDF document text
    • http://benrassam.com/uploads/files/33527978771.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/79932936574.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/gasulixug.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/dogazalezesifo.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/xegazokasir.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/baxinupuridalifum.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/jukubimozijem.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/24695408672.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109040158217532.pdfIn PDF document text
    • https://tepihtrava.rs/files/37378408494.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367e51a5e25---19787994578.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/gepafok.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-12/20210912135336317619.pdfIn PDF document text
    • http://americasbestwingspa.iorderfoods.com/uploads/files/61174932531.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/55478383907.pdfIn PDF document text
    • 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_off0000d253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD253 10148 bytes
SHA-256: 1ec69b6c4c1288dead6431387cf164eec351827ccecef71839c71275773f43bb
font_01_sfnt_off0000e91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91D 20264 bytes
SHA-256: f70b65636cd70dc8a83f2ddf7871b0cad2d895e4cff8764208d24b41f6c601c5
font_02_sfnt_off00011ed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1