Malicious PDF — malware analysis report

Static analysis result for SHA-256 f71af24613882062…

MALICIOUS

PDF

80.9 KB Created: 2021-09-14 21:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 645fdd7df301a1627ee425ddaf837dba SHA-1: 4bf5ea3747d2fb531050cc7495943b95c78295aa SHA-256: f71af246138820622d81c79b76b8d663a80b38c3c57e921f036a08294766693d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is described as a link farm hosted on disposable domains, suggesting it's designed to redirect users to potentially harmful content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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=ps4+second+screen+app+apk PDF link annotation
    • http://constantemail.com/userfiles/file/163159632114464621683.pdfIn PDF document text
    • https://ekransamara.ru/files/muxukepoje.pdfIn PDF document text
    • http://mayphatdienngocquang.com/media/ftp/file/givejisovurojumixowameve.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/18208740679.pdfIn PDF document text
    • http://clerus.hu/files/file/xebojulevowojefu.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/78894747451.pdfIn PDF document text
    • http://integrotech.eu/zdjecia/file/wejer.pdfIn PDF document text
    • https://upaspor.com/resimler/files/66906291735.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/zexutol.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/28752930485.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/28666241712.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da87e8a36d---nodujoza.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/bibazekotuwufibemopu.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/83333106403.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/gawiloxivonomigigaj.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/42335557226.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/52495412202.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/57418866157.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/32246425535.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/e729d2accdd18bbcdffafb9d8bc0fb95/molelogalipofomubotog.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/71101729418.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/57947043043.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tixuzezo.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/82444707710.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/xoxagazuvewijegusikiwedo.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_off0000d50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50A 10444 bytes
SHA-256: 275420ef65068126af17c57be21961a44c2460699d1c1ecfb133b69c8cf69897
font_01_sfnt_off0000ece4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE4 18744 bytes
SHA-256: 3b5eff7fea152246daba620b3106c6ce56e2d7f0494e06b789c938d9e9157f72
font_02_sfnt_off00011dee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1