Malicious PDF — malware analysis report

Static analysis result for SHA-256 07be78ce8219db90…

MALICIOUS

PDF

80.8 KB Created: 2021-09-09 14:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3cfcf542bf328ab124177d0e0ef18710 SHA-1: dcf3d72fd9c0d3dabdab1b5c7a9b2af5164823db SHA-256: 07be78ce8219db906cec339f4a8dcc56dc53ba16bb86a0b1c5496b4b1d2a03b6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this document being used for malicious purposes, such as phishing or distributing further malware. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://cructi.ru/uplcv?utm_term=pokemon+xy+gba+apk PDF link annotation
    • http://hkxhjfc.ltd/uploads/files/20210904200051.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/dexexojereligakop.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/ded7faf40aff61034666c06dbca24ac0/92468977517.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/16351882350.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/92557754998.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/48716336885.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/1584661573.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/48106094653.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/45122159230.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/59957898933.pdfIn PDF document text
    • https://funbugs.ie/files/file/12913831063.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f49ba0881a---gikozekutozemajixiwe.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/99327880956.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/28133861432.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210903_498D6F0988585142.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/63546344831.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/gefodijogos.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/53500151049.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/kosanek.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/2767083592.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/7210682835.pdfIn PDF document text
    • http://health-bridge.in/upload/file/temozamezimupazovisu.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_off0000d57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57B 18532 bytes
SHA-256: fd4fc84fd3f09de9b9c6820644eb9575327e3989cc426086fb151f4b488b6a45
font_01_sfnt_off0001059e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB5 10540 bytes
SHA-256: 6602d74939886acdacfe1016f4350802e0aec46f5d762d45fc86bc8baf5a85a4