Malicious PDF — malware analysis report

Static analysis result for SHA-256 58313ade07f38808…

MALICIOUS

PDF

76.1 KB Created: 2021-09-08 16:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 668bd00d7ad02ac072a012df6765a56e SHA-1: 4c8a6d03c7725b81ccb8aed9299dbe8faa189caa SHA-256: 58313ade07f388089ef7d2fbb186975c0931e2dbbc6cb37af6ac007894e73c1b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://eslms.com/userfiles/file/23751222811.pdf In PDF document text
    • http://inimtrento.it/userfiles/files/fidinojotonutorano.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/zavavuwavok.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/jemakututapatesetixux.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/xasid.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/sexipi.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/zajusutozuwubopujejesavo.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/lilikitelebake.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/79503564732.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210903064332.pdfIn PDF document text
    • http://www.polni.si/Images/files/25509049155.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/9813711686.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/57521532843.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/mimisowoluxedonabajezofa.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f16bf41f1---viwigejobudipukajilupe.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/vetojoruvipunelekulu.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/4a500c549bb244004d21994dfea0b614/52013639790.pdfIn PDF document text
    • http://potlista.com/file/files/rakevolusaguvolat.pdfIn PDF document text
    • http://104408017.linker.tw/files/14038287093.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/gujibalovapazimot.pdfIn PDF document text
    • http://goldmustang.ru/files/files/56408595727.pdfIn PDF document text
    • http://seamacros.com/upload/file/voropup.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/luguzotivivivarisig.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/meruvokapan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=cross+stitch+design+books+pdfPDF 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_off0000c311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC311 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB23 18108 bytes
SHA-256: 57bd8840b4c004250c1decab53ed7b3b696963acf4234451ae17ded174397cbb
font_02_sfnt_off0001097d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097D 10956 bytes
SHA-256: 0ca9583c3d956cc7489b5b781261f06127dc7a442fadcfef238b96bcdac3900c