Malicious PDF — malware analysis report

Static analysis result for SHA-256 a07ec1a5580f49df…

MALICIOUS

PDF

81.9 KB Created: 2021-09-21 23:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34d303ae2457b70a5f3efc756fe1b53c SHA-1: 945f0f0a8a8e1646716f904a74d3d066dcdc7daf SHA-256: a07ec1a5580f49df5d418fca1b71bc9a37cf46b2ca090cddd6f900dd7e9fa834
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URLs, many associated with link farms and disposable hosting, indicates a phishing or malware distribution attempt. The 'SE_DOWNLOAD_BUTTON' heuristic further suggests a lure to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://laborke.ru/uplcv?utm_term=hacker+baba+mod+apk+free+fire
    • http://rotarylaspalmas.org/documentos/file/42520123321.pdf
    • http://we2meeting.com/ckfinder/userfiles/publics/files/7100652544.pdf
    • http://eamenfaraz.com/cache/fck_files/file/3632966021.pdf
    • https://e-motorcycle.tw/upload/emotorcycle/files/95999302356.pdf
    • https://pagodatalk.com/_UploadFile/Images/file/75224640821.pdf
    • http://soleilboo.com/images/uploads/files/ketefevuwutosamunavis.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/71490304414.pdf
    • https://plantbiochem.com/ckfinder/userfiles/files/vurogamoba.pdf
    • http://havefuntogether.com/image/upload/File/16723144083.pdf
    • https://spandoekland.nl/userfiles/file/pafuvawosasabumano.pdf
    • http://mingzhicc.com/userfiles/files/sepizalufulajod.pdf
    • http://ukwoodrecycling.com/userfiles/files/dunedidifujujewojirotefa.pdf
    • https://danfort.lv/userfiles/file/71390311588.pdf
    • http://maility.pl/_ADRESuserfiles/file/63141926521.pdf
    • http://sola-brothers.com/userfiles/file/banewi.pdf
    • http://nakajima-ya.com/upload/save_image/files/tutaxosewopobenamovivaw.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613090f3bbd6a---gemipetapitipikopomaleni.pdf
    • https://askisan.com/upload/ckfinder/files/navibakipadipuwute.pdf
    • http://stl-hk.net/userfiles/23409242316.pdf
    • https://hantverkarenisandby.se/UserFiles/files/45263300807.pdf
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1630874874.pdf
    • http://stellar-toys.com/ckfinder/userfiles/files/11827319677.pdf
    • http://yomamasushitogo.com/uploads/files/gifizixezebezevavegute.pdf
    • http://vinhomeshaiphong.net/app/webroot/img/files/21129665241.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc1b.bin
254beb7eb40d5a6e7be2dc0371a5f6e6610df9d5aa8a16a44eb9af8ee01156e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1B 17876 bytes
font_01_sfnt_off00010a68.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A68 16792 bytes
font_02_sfnt_off0001227f.bin
7f44641d0c4d2a6a0676c4199245830d428124a68fd84da1944d641c8af1d9e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1227F 10588 bytes

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