Malicious PDF — malware analysis report

Static analysis result for SHA-256 75544850766715c9…

MALICIOUS

PDF

76.5 KB Created: 2021-09-10 00:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ac5387565cbf01e4933b10164840a160 SHA-1: fe6a3e216029a1482a2e53a2cd99571a53b6b118 SHA-256: 75544850766715c9309232ac60681d4a413c6dbe14857dffa0e3d79234fd2132
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or phishing sites. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document delivery, often involving embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://oniceh.ru/uplcv?utm_term=mobile+wallpapers+live+wallpapers PDF link annotation
    • https://skillmapmagazine.com/ckfinder/userfiles/files/sesesavilodo.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/88086687318.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/kabunowidagonovut.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/mazususuku.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613324397f180---17633532031.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/63705997698.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/kozusejopovorugoj.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210908202647_wnhyli.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/jepoloxa.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/zixukalorawed.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/34458102258.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/butegoleluninifigemefadut.pdfIn PDF document text
    • http://zenithmetals.com/files/zovodatisegulinepigib.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210910054350.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210904185121.pdfIn PDF document text
    • https://12shio2.com/contents/files/73336350886.pdfIn PDF document text
    • http://ggbris.com/slbdavbatala/userfiles/file/xudolepusukaf.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/80040537627.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/40805725141.pdfIn PDF document text
    • https://granitnet.hu/editor_up/lujaponixak.pdfIn PDF document text
    • http://siemreaptraveltours.com/userfiles/file/filulefe.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/3043169800.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/fojibebozamunotewe.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/sinovupadudog.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_off0000c8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FB 10328 bytes
SHA-256: 22a1c91ed37af6d7e205d4932172e1d5d652f93839004d6407dce043301db14a
font_01_sfnt_off0000e033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE033 16956 bytes
SHA-256: 5a9ba13df6582cc0ac22af2d23b8dd19434d8464df72b8d244c7ea039c94d066
font_02_sfnt_off00010c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1