Malicious PDF — malware analysis report

Static analysis result for SHA-256 a12b98f91d341f62…

MALICIOUS

PDF

75.0 KB Created: 2021-04-02 00:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a436d73b59b36757b5c1e55b9dac974 SHA-1: 22f881dc3376336939bf6fda01bc1e2c06a8e3e5 SHA-256: a12b98f91d341f62410ef18d8c755731e81a3dda7c6af3668e75f39d180a63cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with a critical heuristic identifying it as a PDF link farm. The primary URL, 'https://nipisod.ru/wix?keyword=game+killer+no+root+apkpure+download', suggests a lure related to downloading software. ClamAV detection and ML classification further indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/wix?keyword=game+killer+no+root+apkpure+download
    • http://xolokukifimiv.sportsontheweb.net/luis_vaz_de_cames_biografia.pdf
    • http://gagitevanonuti.mywebcommunity.org/97742251801.pdf
    • http://gepidudida.iblogger.org/62041709309.pdf
    • http://tebepif.22web.org/anemia_who.pdf
    • http://pubomoxagu.22web.org/secure_boot_disable_android.pdf
    • http://jenerotisa.mywebcommunity.org/xuxidakanupijowaritafuwe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • https://uploads.strikinglycdn.com/files/b04e78bd-1540-4c2a-b393-73ad8a6d2d1e/niripovumi.pdf
    • https://uploads.strikinglycdn.com/files/58737555-66da-439b-be65-72d6cecb2ad1/sisemafudilojimidin.pdf
    • http://nununad.myartsonline.com/10414543401.pdf
    • http://zimopup.myartsonline.com/jeloniriwigerenegifafe.pdf
    • https://uploads.strikinglycdn.com/files/e68b6a97-f383-4e8c-8c57-8d7068093191/what_does_a_high_absorbance_value_mean.pdf
    • https://uploads.strikinglycdn.com/files/6ede6c88-8994-4cb5-a5af-d0471f137c59/what_size_belt_for_cub_cadet_ltx_1040.pdf
    • http://wozitoso.atwebpages.com/91856009014.pdf
    • https://ff06b2c9-6223-4357-b4d5-1bf3807c749f.filesusr.com/ugd/717131_43d11fe6d85043468da4ad289226d8ab.pdf?index=true
    • https://5902ff30-e651-486c-ac37-3e8383bfa78f.filesusr.com/ugd/f35da0_23b448eaf8ee4ee5beab844abffc07c0.pdf?index=true
    • http://vumupekosevi.rf.gd/hire_interior_designer_online_india.pdf
    • https://bf5f3f24-cfb9-4aec-9f01-83e6d863dc5b.filesusr.com/ugd/1f4526_ba623209f4044690b2f8df5c08c8b157.pdf?index=true
    • https://uploads.strikinglycdn.com/files/abe89414-18e7-48f6-aaab-36b6d563624e/riwipumuwuvuziwesediwen.pdf
    • http://botesuni.epizy.com/how_to_customize_google_search_bar_android.pdf
    • http://suvalomimo.atwebpages.com/allopathic_medicine_guide_book.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://scripts.sil.org/OFL
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d737.bin
0c71658bd6cca66c52b99dedac9f0d2bcbf81c4702bddd768a43f8654554cdf4
pdf-font-stream PDF embedded font (sfnt) at offset 0xD737 5116 bytes
font_01_sfnt_off0000e892.bin
a343fe701a4fc76e84bb42dd1ed8ca1b4c9638dfd78aed0db1ffc2cd0e303a4d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE892 6648 bytes
font_02_sfnt_off0000fa39.bin
ca01c1f8f0ef384cc90b27db862d8675442f0df0bcb4b97715b15c210f677c31
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA39 10716 bytes