Malicious PDF — malware analysis report

Static analysis result for SHA-256 4952626889c71aa0…

MALICIOUS

PDF

79.2 KB Created: 2021-09-14 02:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: f2b0c23fcd17d3828b6e0259d594c115 SHA-1: 2fa3c2cebb02eed70c9ed25cdecea00788b6c3ef SHA-256: 4952626889c71aa0addc50a14d6fc41b1529934284b6681fe086ae9a276ccad9
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a callback phishing lure. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious sites or potentially download further payloads. The presence of numerous distinct hosts and links points towards a link farm used for obfuscation or distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://elvirajogsi.hu/ckfinder/userfiles/files/xebezuvet.pdf In PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/wirotovetapololuxenebibud.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/21702842782.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/95713988913.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/7795265321.pdfIn PDF document text
    • https://raljob.com/userfiles/file/4063502858.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613d13aeee99a---rurozizibejego.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/48562880180.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/sesuzofafuletadejigakoxef.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210901082530.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/luvepojup.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/mejew.pdfIn PDF document text
    • http://szm.hu/userfiles/file/fazuzunarafozasozidebew.pdfIn PDF document text
    • http://eva.am/files/50b608fd32d44fdf.pdfIn PDF document text
    • http://zae.me/datafiles/file/raboronotupagogogovi.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/vojawalati.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/60677681727.pdfIn PDF document text
    • https://msiutilities.net/documents/deter.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///10506089727.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/tixejanow.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/nuwukevorusi.pdfIn PDF document text
    • http://jar-ted.pl/file/1466561823.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/75385282805.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/polekapibinonozadonim.pdfIn PDF document text
    • https://12tiga.com/contents/files/pigonafodawopeme.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=application+software+is+used+toPDF 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_off0000d177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD177 10780 bytes
SHA-256: 503be01040b37e71f032c6d21720a049895739d2889eb3d4a72aa48ca313a1e2
font_01_sfnt_off0000ea8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A0 17276 bytes
SHA-256: 2c9f63a1fc0bcb4b079b6be0ddd28aa49472cd666cdeaf0e4f8b992e67923067