Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca67a7b7a2f87a30…

MALICIOUS

PDF

70.9 KB Created: 2021-09-25 14:37:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fe1388fb7a20a888947d5f2540551dbc SHA-1: 63c03eb63d2e7e58e8b93068f0f8ef419d62e364 SHA-256: ca67a7b7a2f87a308398cc2b7a287cfead566062ce7f3eceb3904eca426c5e06
166 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and SE_LOLBIN_RUN_COMMAND heuristics further supports the malicious nature, indicating attempts to manipulate search engine results or execute commands indirectly. No scripts were extracted, but the overall structure and heuristics point to a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://projetounificado.com/uploads/files/folikesu.pdf In PDF document text
    • http://cuspsurgeons.com/userfiles/file/31903130432.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/1109cf8a1adb07feab0f675543e8d0ec/8189549277.pdfIn PDF document text
    • http://konberdbio.com/upload/files/50509572694.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/93774053984.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210925_6E946155C39282F0.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/68823907454.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/leranozuwufijemuk.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/lomorojanawatotowe.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/wafidodezenujilejukam.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/gemubufupizituratelazuvo.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/37602400128.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1632197343_5afa442dde.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b4f8db01c3---kinanemazerukojuma.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/palowidefewar.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/51910699650.pdfIn PDF document text
    • http://haai.org/upload/file/14799369881.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/92683438648.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/rivajerenidibagob.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/kusipoxuxada.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/supuxukago.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/65246625601.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/kuneporazalopevekajiwar.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/pemekavifigaxoxisow.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/33711393061.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/37203297142.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=gta+5+cheats+pc+super+jumpPDF link annotation
    • 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_off0000b366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB366 10680 bytes
SHA-256: 2dc03c77df2c71b82f34b766a178ebde7f1d2c5abb9b06fde13840ec27ded788
font_01_sfnt_off0000cc04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC04 16584 bytes
SHA-256: 527d88ae1876abe39e98cfcd544aeabb12a467fd93b4172fd8058a0f2164bfa8
font_02_sfnt_off0000f5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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