Malicious PDF — malware analysis report

Static analysis result for SHA-256 04d86bca1fe836af…

MALICIOUS

PDF

77.9 KB Created: 2021-10-09 16:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: dedc7691e466086cb786ed6be406550b SHA-1: 52b7da2185369215350d136071fd842503582c7a SHA-256: 04d86bca1fe836affcd6695224cf2977b5fd8232f052978bcdddca3e9066019a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or trojan distribution. It functions as a link farm, containing numerous embedded URLs pointing to various domains, likely intended to redirect users to malicious content or phishing sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a structure designed for link proliferation on potentially disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://wastran.ru/uplcv?utm_term=hot+chip+and+lie PDF link annotation
    • http://polletnv.be/uploads/files/77746900610.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/wezodijejenifafumufe.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/c0b92bd930bf6428db6aeb99b8afcbcf/12390718373.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/2822128947.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/feruzi.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/netut.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/96892317884.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/nizusobenezujiguxajesuw.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/wigovafomuzunezuligep.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/63923681077.pdfIn PDF document text
    • http://xn--42ci4cc0aric4a6dd7c5af9nef7sg.com/userfiles/files/52433731506.pdfIn PDF document text
    • http://taborgospelassembly.com/userfiles/file/kevazug.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/lubasasoro.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/fobopajitujil.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/96332660672.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/63315143173.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/36761879191.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/11830291825.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/16662751327.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/c1588d4b0c9c72fbd071244a82388169/kigerosirupimodin.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/dirimod.pdfIn PDF document text
    • https://cape-electronics.com/media/file/sugopinebiraza.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/kewusobex.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/nopavenoxuteworiwafave.pdfIn PDF document text
    • https://keongracun.org/contents/files/lofiwugijafozidalokede.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/54538015095.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_off0000ca3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3A 10336 bytes
SHA-256: a71fce6ebf4ea3703694e9f1bad9151c3f8d9c3149e625d15dc0eeb5113dc0c0
font_01_sfnt_off0000e165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE165 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF977 18464 bytes
SHA-256: 679b3aa1ce804bc11ae85af066d4304cdd901035abbae52c8fcd58fb365177a0