Malicious PDF — malware analysis report

Static analysis result for SHA-256 f19022c2287bb9ee…

MALICIOUS

PDF

69.7 KB Created: 2021-09-30 20:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6b29be7b8bd4b8a9ca81aa8dbe453ef4 SHA-1: 7e3f08894055def917757440a37d57d12446c7c5 SHA-256: f19022c2287bb9eeff8812e51e2cdd94618109c684d1366a207b2dfd773b91ef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and employing UTM parameters, suggests a phishing or link-farming campaign. The PDF's structure and embedded links are consistent with attempts to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://crewmak.ru/uplcv?utm_term=es+file+explorer+pro+dark+theme PDF link annotation
    • https://sunpower.lv/ckfinder/userfiles/files/11994279924.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/21823773115.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/57371916897.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/84592946688.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/56210200284.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9e59722fa---93781290057.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/woxubopoxowowebivabevalu.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/gobixotozavaku.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/masixuxopuzivajawura.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/2779903092.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/8701831811.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16328116082515.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/47882090296.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/75129406939.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210919040826.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/84125222728.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/zidijezovi.pdfIn PDF document text
    • https://rcot.org/userfiles/file/gozobebabimepep.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/lulevim.pdfIn PDF document text
    • https://myoffice.strategygroupglobal.com/uploads/files/welokazuxa.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/93825576572.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/regolilodupijokuf.pdfIn PDF document text
    • http://www.bash.cl/media/file/967728213.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_off0000afb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB8 15276 bytes
SHA-256: 04e3979da9c2923e2178ee5cd44f2947145c6bc60fdd2e61404509a56dd5620f
font_01_sfnt_off0000d61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61A 10836 bytes
SHA-256: 786132ea86e3e62505acd8d3ff0170e490f2fb81aea58579ae1d3e7f23c41933
font_02_sfnt_off0000ef1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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