Malicious PDF — malware analysis report

Static analysis result for SHA-256 4238d2f2e1e03bf4…

MALICIOUS

PDF

87.7 KB Created: 2021-09-14 11:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ba84994abec73dc332ff8f16c2bdc0ac SHA-1: d3eb9d584d11e5e74f3023853b6affb4f0d1ed91 SHA-256: 4238d2f2e1e03bf4cf62a7ec184a856819374e563b12d49a2abf457e822801b7
126 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 link farm PDF. It contains numerous embedded URLs pointing to various domains, many of which are likely phishing or malware distribution sites. The presence of external URIs and the 'link farm' heuristic strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://synerhu.ru/uplcv?utm_term=online+latest+movies+free+watch PDF link annotation
    • https://tefen67.com/userfiles/files/wupuluwinonurulamusuref.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/2067859732.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/xatalen.pdfIn PDF document text
    • http://parentini.it/userfiles/files/43318227432.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/12661447027.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/jozeb.pdfIn PDF document text
    • https://rinducm1.com/contents/files/58875023969.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/xomoberenil.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/72665936399.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14861351972.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/42259303838.pdfIn PDF document text
    • http://tabletopad.com/images/file/sepexexodetefi.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/wunugubaguzegoza.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/58040218383.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/sudimixojadelafubojojudum.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/tanuvapurixusabexixa.pdfIn PDF document text
    • https://osakadentalcare.com/contents/files/gatafirizapisijij.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/d02b807a113b2b074d958c2adbccc00b/51872544787.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/xotafofavaliza.pdfIn PDF document text
    • http://honghuibio.com/d/files/gidatiwuworodato.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/50800029825.pdfIn PDF document text
    • https://soechi.net/userfiles/file/wexujupipolisuza.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_off0000f3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC8 10780 bytes
SHA-256: 9e4bb210ef6004c4d65a92216462f8a93cfa2227d3d4aed05153fd92f1fdf293
font_02_sfnt_off0001247d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247D 17520 bytes
SHA-256: c7a8f0a102f00de036d250b671e3dd9fff03cc74d04fcfcca61b332c34cc914d

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