Malicious PDF — malware analysis report

Static analysis result for SHA-256 0862164eddd841a7…

MALICIOUS

PDF

82.4 KB Created: 2021-09-19 09:35:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8c2da1de2d1a0b9b4718b2b451cc3d4b SHA-1: 15943e7e2bdf60488d2bb9064532e58be8683526 SHA-256: 0862164eddd841a742822f221a515b12a770116f52860453d38c671fecebcec5
134 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The presence of a 'download button' heuristic and the structure of the URLs suggest a phishing lure designed to trick users into downloading a payload. No scripts were extracted, but the overall pattern indicates a malicious document intended for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://infrive.ru/uplcv?utm_term=jail+breaker+apk+download PDF link annotation
    • http://mofrantech.com/userfiles/file/93049136221.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/44518711796.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/33064125687.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/wapiwalinonosir.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/98790044464.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_08_10_31_57_9722.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/mokopize.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/80789617479.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/66647435441.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/15333132925.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/nugafurolefubelelodu.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/65680652703.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/vuxivojupiluja.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/40647824850.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/19939126527.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/84807246401.pdfIn PDF document text
    • http://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/23238367797.pdfIn PDF document text
    • http://koddous.com/userfiles/file/78551709275.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/161426cfb70c63---64112695570.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210919014828.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/780a7820fdc2e522a81959d4dff4cb16/1019634254.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/kanafobosipibogip.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/57643251577.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/folexotimot.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/wagiwiviweguziju.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_off0000d824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD824 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF036 19980 bytes
SHA-256: 7ac6b0c1ba1c91a1a68c6070999c52cf7477b2c53394f199c96a5a1997b4e1a7
font_02_sfnt_off0001249d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249D 10428 bytes
SHA-256: d06ddb6edbbe616c014687b1673dfa26e7143cff5faadd686b4f25b6c5c0b41b