Malicious PDF — malware analysis report

Static analysis result for SHA-256 d92741fc0cdad7b9…

MALICIOUS

PDF

81.6 KB Created: 2021-09-12 07:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d2f7e557b4f0ec324f03af9f5dcb5959 SHA-1: 9b8863224e3c73808b5b446a6213b819568f2ab5 SHA-256: d92741fc0cdad7b994aa64f3e779a9687a76f235011f3034202778ba98e47e74
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to PDF files hosted on disposable domains, suggesting a link farm designed for phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document's structure is optimized for search engines to promote these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://xn--b1agpbmdtf.xn--p1ai/upload/file/34801330721.pdf In PDF document text
    • https://eqonetech.com/upload/userfiles/files/jekuvimekose.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/rugepemivirimajigamikusan.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210905032018.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/40449380379.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210909_42175328F4485361.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/muxirubaxa.pdfIn PDF document text
    • https://haidangpc.com/contents/files/33332553507.pdfIn PDF document text
    • http://prmakeup.com/Image/files/winufevuza.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/sipomolanivavuvigufameber.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/30325275435.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340f2622ec8---sotetogatanenog.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/41856223147.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/wafojav.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/mojunewufu.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/woritirajutila.pdfIn PDF document text
    • http://elsped.hu/files/file/97947894585.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/jupuwugal.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/26996101018.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/sonozexukefeligep.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/7927138212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=android+phone+camera+hacksPDF 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_off0000db41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB41 10708 bytes
SHA-256: f46c64151c914d4e8fdec0e7277083623d09722b5c35336495aedc4c76f4d008
font_01_sfnt_off0000f39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39C 17916 bytes
SHA-256: fb615c6e6cc2b1c5d97a49442b62b9eed48ea8bbda8eaf50fa0ea4e46d4d4bb4
font_02_sfnt_off00012290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12290 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.