Malicious PDF — malware analysis report

Static analysis result for SHA-256 61985c802d37b981…

MALICIOUS

PDF

70.3 KB Created: 2021-09-25 05:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e17cea698e842a362f250491a3552e3b SHA-1: f79a21a524433640b56218691b2753337b27c7ac SHA-256: 61985c802d37b9812ebd43afb28aa7745877874b4d11f854c343d2902234f865
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The presence of external URIs and the overall structure point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://medvor.ru/uplcv?utm_term=my+left+part+of+stomach+is+aching PDF link annotation
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c224ff792fa6bf5e79a41581f97e0050/85775120266.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/13814448853.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/wefoxiseto.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/21327608262.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141e85054b93---69470985878.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/83708609948.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/12986461584.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/novunuvebawo.pdfIn PDF document text
    • http://17njl.com/userfiles/files/31910776415.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/bekopokilo.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/xobejilatafarutesokiwub.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/ditenujefejimizonuruzakab.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/22238142558.pdfIn PDF document text
    • http://ropesadventure.com/d/files/32429019755.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/tisonorus.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/98249058981.pdfIn PDF document text
    • http://atek-ent.com/upload/file/2525613502.pdfIn PDF document text
    • http://abc-tel.ru/data/File/89769071636.pdfIn PDF document text
    • http://spakimthi.com/upload/files/zewinesixofodilumup.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/gaxuputakatudulef.pdfIn PDF document text
    • http://micdelhi.in/userfiles/file/ridonefebozanu.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/19221776431.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/bokizodotonatodadulud.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_off0000b18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB18B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99D 15632 bytes
SHA-256: 05e9bcea39eb4571175d3b93a5816a1e0b39aa2be6d1836a67de716d7155d124
font_02_sfnt_off0000f18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18E 11032 bytes
SHA-256: a95135f7152d524c4709006d1abd86ab87589a6250a3d0d6f711a83c2ef94ee3

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