Malicious PDF — malware analysis report

Static analysis result for SHA-256 42908cab0fdf534c…

MALICIOUS

PDF

79.0 KB Created: 2021-09-17 10:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5fcb4f6050a5ccfbc12a2343406401b2 SHA-1: dc5975309521e1bcfefe01f56386320891762346 SHA-256: 42908cab0fdf534c5e983a7c67246314a0b8f05c1b06cf8d48c28adc1d10a2ce
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including a link farm on disposable hosting, and a heuristic for a 'download button' lure strongly suggests a phishing or malware distribution scheme. No scripts were extracted, but the overall structure and URL patterns point to a malicious document designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=poco+launcher+hide+apps PDF link annotation
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392f26e6097---wupenula.pdfIn PDF document text
    • http://markone-tools.com/upload/files/zemolurepegopawisinaro.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/fidetitile.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/35064117465.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/57645566665.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/xigojepun.pdfIn PDF document text
    • http://unityproductions.com/upload/files/78928433017.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/63953312031.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109101403288800.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/delebufiwazobop.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1613833c78bd77---pexusebuveton.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/gosuxarusigavaje.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/48803373808.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/52883718577.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/mejegalesotel.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/77399397448.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210912081750.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/58102560286.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/jutirikesulevisutagezeji.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613941aef0f51---xuguriw.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210903_D43AC4FAF1DEA4E6.pdfIn PDF document text
    • http://ebara.com.hk/ckfinder/Zenith/userfiles/files/wifomizowunapatela.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/77409430830.pdfIn PDF document text
    • http://ailizia.com/userfiles/23485723323.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/fifatejinatagovojixejazem.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_off0000cf06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF06 18192 bytes
SHA-256: e216ec4832cc1c02af1ff23059911a7d4a5a14f0eb2c6c1f55e694063961c7c8
font_01_sfnt_off0000fe37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE37 10616 bytes
SHA-256: a27997f75680ddce2560cef0eacdfeb6ab98937b55fee96c42a0ed91664bf34f
font_02_sfnt_off0001165e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1