Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f5af55e2ffab00…

MALICIOUS

PDF

68.9 KB Created: 2021-09-25 02:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cb7bbf68327a70dc0c05845c6eaf9239 SHA-1: 64500d34df8628d71f35633cff2a70287fa8c64e SHA-256: f9f5af55e2ffab00645c1387fcf93db01c892fd840643c374742eb09b86848a2
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it's a link farm on disposable hosting, with one direct link to an IP address. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://185.33.116.142/~bbyacht01/upload/files/tovajakojaxen.pdf PDF link annotation
    • http://khodahoanglang.com/admin/webroot/upload/image/files/72340715428.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/13153450033.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff7bf70c09---motilusiw.pdfIn PDF document text
    • http://vejwun.cz/images/77488149998.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/85868828013.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/c3ba798256e4f55e7fc78c4ca634b15d/xiwibejixubuwa.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/goranavomufavomuluwixoxi.pdfIn PDF document text
    • https://carpenterstouchnj.supremeroi.com/FCKeditor/file/61143940601.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/wezezubugi.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/solagolajazebavatakuf.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/37007565743.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/fivuzoponezali.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/54103010299.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021090800330873499.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/nisagaxevefagatutuxepi.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/24093138804.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/47139045124.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/51518335023.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/nemubonitarifadimiwobew.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/34121763388.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=friv+games+jogosPDF 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_off0000afae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C0 15432 bytes
SHA-256: 588697c68cb5be023a4ab89a4f1497ec1320db73194da8a8da599231db73c0e4
font_02_sfnt_off0000eeb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB9 10376 bytes
SHA-256: 3882d6208d2f5760b0d7fb4e3a5bb2d48ae1d3b4e7c3694cb2a1371d307b8e52

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