Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b5ab105a661b3fe…

MALICIOUS

PDF

77.9 KB Created: 2021-04-02 11:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c1f95b70dd4d5c75654d07c901b4c18 SHA-1: dbb58af86223a73380e3ea3d429c29c570875859 SHA-256: 6b5ab105a661b3fe791e81d6ecd06d10ec8b40517e2e51f24632f12dddb79cc0
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a mass of external links, many pointing to PDF files hosted on services like Weebly and S3, suggesting a link farm or SEO poisoning tactic. The embedded URLs, such as 'https://leonvi.ru/wix?keyword=the+weeping+woman+description', are likely used to redirect users to malicious sites. No scripts were extracted, but the PDF structure and numerous external links strongly suggest an attempt to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/wix?keyword=the+weeping+woman+description
    • https://talunijepi.weebly.com/uploads/1/3/4/5/134599753/tunopowesovoz-binotabife-gejumugutemu-tuzivadosawi.pdf
    • https://pekumovulimezel.weebly.com/uploads/1/3/4/3/134363026/ee4fc4e40a14a.pdf
    • https://static.s123-cdn-static.com/uploads/4499629/normal_5fc72a1beeac4.pdf
    • https://bokixewabukogu.weebly.com/uploads/1/3/4/3/134341992/soxefijulirepajoba.pdf
    • https://cdn.sqhk.co/dafibuxoki/hhXkbAq/wibitulofenapinosoj.pdf
    • https://cdn.sqhk.co/vexavudakepa/iQCThid/60891284010.pdf
    • https://cdn-cms.f-static.net/uploads/4500904/normal_601a49d72f096.pdf
    • https://cdn.sqhk.co/mugolino/7hij3jc/41594665901.pdf
    • https://cdn.sqhk.co/devurekon/9tp1haq/40462501638.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pizexopenaxu/guide_du_routard_israel_jerusalem.pdf
    • https://s3.amazonaws.com/pozokimepe/valesinubozetazob.pdf
    • https://s3.amazonaws.com/vebisop/sherlock_holmes_a_game_of_shadows_full_movie_download_in_hindi_dubbed_480p.pdf
    • https://c30b87d5-e38e-4f4c-8f61-e356d9eaafe8.filesusr.com/ugd/347120_8e00492bf7814808a81c71541d637351.pdf?index=true
    • https://s3.amazonaws.com/petubapizo/57702958095.pdf
    • https://s3.amazonaws.com/kujesulad/canteen_management_system_android_github.pdf
    • https://73c25812-7308-4b32-b985-10e2a25710ca.filesusr.com/ugd/5b604d_27fdc4b2f8c642359cfd048d97d2b79e.pdf?index=true
    • https://s3.amazonaws.com/lanaladu/american_red_cross_cpr_practice_test.pdf
    • https://s3.amazonaws.com/bifamomove/dufila.pdf
    • https://s3.amazonaws.com/xisefowu/jemijuxa.pdf
    • https://38e81cab-313f-462b-917d-d566bf782aa4.filesusr.com/ugd/36aba1_41724827ec9e4c00b9bad5b46a7fbcf7.pdf?index=true
    • https://s3.amazonaws.com/lijopavexanuse/dizosadanupadat.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4d5.bin
e1972ed1e3111b807aacedb67a7d934c25eec92ba897e2a65d6b3c93263bdb95
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D5 5496 bytes
font_01_sfnt_off00010770.bin
a6ee85828e600542dbceb5ac4bdf913388f0cde651f3680160899eb1595288f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10770 10100 bytes