Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8617b315bb05a01…

MALICIOUS

PDF

91.9 KB Created: 2021-09-21 10:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a8f0e284fe0294372e6590c0c923cf79 SHA-1: ac984a6a90245e1e1b4c76384b832421a0009c2f SHA-256: f8617b315bb05a01b06d30345dbf2358702796b5c4f5ecb9a42a00044a140c58
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards the use of client-side execution, likely JavaScript, to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9777

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://pixomot.ru/uplcv?utm_term=garageband+android+music+production PDF link annotation
    • http://metamorfoza-krosno.pl/userfiles/file/xazeromasowexazunitubes.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/ebbfa04be6731f7994f1f6fd6cc5c8db/pekiw.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/2109040614316993117nmbi0.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/23270829940.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/53530347099.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/lonawovojilexupop.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/zerijizakegujid.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/puxelu.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/ziwujomo.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376f52d7b3b---levonabav.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/zawiwabevenati.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/74478349689.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/18030147600.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/95429832403.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/92187452767.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/wogexewamugekugexun.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/nenosujojumutaledo.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/pogorewun.pdfIn PDF document text
    • https://thermaltrailrace.com/imagini_ws/xesesibogupedug.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/78579166928.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/92390440133.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/baxewomuxar.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/xumilafudesoruzi.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/53617393410.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/32182273942.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/41346517881.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/novatudewozeripejovug.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21E 11092 bytes
SHA-256: 599af0ef8c52783523cf77ec213bb3fcf7941e1b2719545d146ceefe886bb41d
font_01_sfnt_off0000fb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8F 19120 bytes
SHA-256: ed6804b572efd0a2a9ce755b9b088f238c27a933956cd6068370e415283a04e2
font_02_sfnt_off00012cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEE 17824 bytes
SHA-256: 81633bab3f761dfb27922105499b2017258cc95a9c861f48e49b426d572c55a3
font_03_sfnt_off000148a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1