Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e916a69ff97cb19…

MALICIOUS

PDF

81.6 KB Created: 2021-09-22 09:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4785bf7422d8264f3c43cab47d9b1e00 SHA-1: 2893a62877ce621f57048844cfde5ce980c2359b SHA-256: 7e916a69ff97cb19d8b1b469f4e585f3ea544bb73e481be84c6159c4a0690f20
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and likely phishing-related. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate an attempt to lure users into clicking through to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=meteogram+pro+weather+widget PDF link annotation
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/wovepefazopogu.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/wolurufor.pdfIn PDF document text
    • https://derfo.info/resimler/files/wekibotezarifafewon.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/41819026099.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/80993770512.pdfIn PDF document text
    • https://termofriz.rs/files/77924718927.pdfIn PDF document text
    • https://drlanda.hu/user/file/zowefixu.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/lisekedisanotomomugoje.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f301434310---98413664230.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/94867622912.pdfIn PDF document text
    • http://olapromos.com/ola/uploads/editorImagesfiles/95508755045.pdfIn PDF document text
    • http://usmleworkout.com/files/file/37091260127.pdfIn PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/vigefok.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/getez.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/maretamo.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/83654225864.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109011102066163.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/91837221945.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe8ca6c119---vubutal.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/tefumuzexekijeto.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/bedekojawumilaf.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/dodolokezos.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/jitimabojimixujuva.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/5750088623.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_off0000d95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95D 10600 bytes
SHA-256: 9ec21576460499a7d581bc729892bef10b92c362e10d219dfcf9147a00787722
font_01_sfnt_off0000f171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF171 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10983 18484 bytes
SHA-256: 41babf9369350db1511f233766b1a6c7756d659eb160f5480461caf49a4d3170