Malicious PDF — malware analysis report

Static analysis result for SHA-256 53fe7a470a7f9294…

MALICIOUS

PDF

84.7 KB Created: 2021-09-09 07:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d8b446c6482bde4485549c6919c54354 SHA-1: 39e05026a3f74f3b39f108eba20aa582430edf12 SHA-256: 53fe7a470a7f9294e3c3d17b485c14c82802067c41ad56b78e9d1bb948577f7d
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable domains, designed to act as a link farm. One high-severity heuristic specifically flagged a PDF link to an algorithmically-generated URL, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly support its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348091bbaeb---lorasudumorotexuweref.pdf In PDF document text
    • http://sinice-rasy.cz/files/file/33178145050.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/68177330982.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ziwipivutotadupo.pdfIn PDF document text
    • http://jeanchapleau.com/userfiles/file/dobubafuniwiwoguniko.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/36123702635.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/jikefakefuxalovopuna.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/rexeloji.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/27273398297.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/jumojobenonejowosi.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/24756830406.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/32579256993.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/dikuruwimodupijasim.pdfIn PDF document text
    • https://primer-spb.ru/files/files/74718298933.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/72063239369.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/75836545059.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/72951635950.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/rivijenafobazujej.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/sobanowezag.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/kepixukul.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/sudadajetofikozi.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/87452561897.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=firewall+app+androidPDF 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_off0000e77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77E 18056 bytes
SHA-256: 6328f311a57affee5502d035c7fdf267cc3a3952be25cdcff710ca271772af77
font_01_sfnt_off0001166b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E82 10180 bytes
SHA-256: ce30490d5cc1cf9e8c7704c72d73bb23297ffd00f86fd96c69009d18836ea41a