Malicious PDF — malware analysis report

Static analysis result for SHA-256 e97d79b6485c84ae…

MALICIOUS

PDF

79.2 KB Created: 2021-09-22 12:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e17024de102af626956fd7c0e5a28f16 SHA-1: 8f4112cf892b0ae2f2a258e1ba75aa6f7f4ce7b1 SHA-256: e97d79b6485c84aedcce6b43f1de6c1c36f376733fdcb4ae4c864972c7d0ac7c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were extracted, the presence of many external URLs, some with unknown reputation, supports the conclusion that this document is part of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.synagoge-stommeln.de/ckfinder/userfiles/files/28341609949.pdf In PDF document text
    • https://sonerofset.com/userfiles/file/vogapusapetisofatiboza.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/fukum.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/36969882016.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16141a1e531218---20605615232.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/wuzowuxe.pdfIn PDF document text
    • http://rinsacars.com/files/others/jigowufifunotoseru.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/juluwuguxaro.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/3020286476.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/6650640178.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/25502507169.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/83194438467.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/33316693149.pdfIn PDF document text
    • https://acerocorte.centralcms.cloud/galeria/files/76568175576.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/pafotemuzewexininod.pdfIn PDF document text
    • http://scantech3d.com/files/magape.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/96906345751.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/b78bb171ecfdfa4c04ff484a7550da9f/91096774304.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/kemimokasa.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/4144647047.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/gusepixozavebopagizapu.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/lilifedaladawilu.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/sadijulajotituju.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/fabosexogotesaro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=quel+format+audio+pour+androidPDF 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_off0000d1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B5 10652 bytes
SHA-256: 79d0bc43aa24fb1cafa5e2114bf433f5ba70db4f277d941a6d616b0e43733ebf
font_01_sfnt_off0000ea16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA16 17232 bytes
SHA-256: f1dec578c480d1fd056f935b0fe57bc4a03827a6112cb78501e1095907c350be
font_02_sfnt_off00011544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11544 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1