Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f2a5fba84259926…

MALICIOUS

PDF

67.8 KB Created: 2021-09-24 19:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d08e934c0d6dd74ea5d9482b8743155b SHA-1: 67a94baf68b35304b0231780a1008be0bd86fb06 SHA-256: 2f2a5fba84259926a4e226dd0531257718b02ca6c1bcb1b645eda9b3a47055c3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The PDF contains numerous external URIs and is classified as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit users via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=dark+mode+chrome+laptop PDF link annotation
    • https://emprenderem.cl/files/lukifaromupigutenufope.pdfIn PDF document text
    • https://dutchhaves.com/uploads/files/202109240933528789.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/89376172735.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1614706b44c4db---1043779634.pdfIn PDF document text
    • http://touchpanelpro.com/upload/files/92464653035.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/gigabukofitesuzunokosat.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/22171848214.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7e3ce06e8---78143923750.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/fupesunoxagus.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/begasunitubiduniw.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/vukukepujixawejazozipoba.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/8437255927.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/22932373598.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/rodirofusubokurukejamupix.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/sejovidapi.pdfIn PDF document text
    • http://phfamilyrestaurant.com/uploads/files/54235856980.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/47697829217.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/1726606631.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/pogegulexuzaxatulozukin.pdfIn PDF document text
    • http://coolscape.info/images/files/8153863575.pdfIn PDF document text
    • http://rentaruedas.com/files/others/fowezidam.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_off0000ac97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A9 15048 bytes
SHA-256: 3ec212d2231cb66214acd31d4ab249a70f65fd1f27847f8c4ba856974e3fce9e
font_02_sfnt_off0000ea3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3B 10508 bytes
SHA-256: e3c1e654c18c0b40a3b2b6c5238b3b5207b3173494ff9761b82c83a892211f3c