Malicious PDF — malware analysis report

Static analysis result for SHA-256 db575caa41fe5125…

MALICIOUS

PDF

77.5 KB Created: 2021-02-27 22:45:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b8e50c1b64b4d93f1034a96640ba8f94 SHA-1: aee8679a9a1d209a25ab5c91ad9c2e21e7fba3e2 SHA-256: db575caa41fe5125695eb11210c19e5fdf09de2fae4ab8fa58e1f070727f2e33
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing a large number of external URLs pointing to disposable domains. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect users to malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://lozipotod.ru/123?utm_term=what%2527s+the+song+of+the+year+2020+south+africa PDF link annotation
    • https://sajosapisede.weebly.com/uploads/1/3/4/3/134344890/fezirijurug-vusadasolef-toguvuwafej-firigokejewa.pdfIn PDF document text
    • https://tevumusavobe.weebly.com/uploads/1/3/4/1/134108657/a714b19d8a3ea.pdfIn PDF document text
    • https://cdn.sqhk.co/rewufarelaze/PhcZyKL/xopadorufokekodanozozupi.pdfIn PDF document text
    • https://nateguwab.weebly.com/uploads/1/3/1/4/131453796/jasupof-fimazabewovot.pdfIn PDF document text
    • https://dotawipe.weebly.com/uploads/1/3/5/3/135323210/7c8b97ccfd37b9a.pdfIn PDF document text
    • https://cdn.sqhk.co/samekikogeri/HbijjbC/war_of_kings_facebook_game_cheats.pdfIn PDF document text
    • https://kamobukumigudeg.weebly.com/uploads/1/3/1/0/131069934/e5e1aaadb.pdfIn PDF document text
    • https://cdn.sqhk.co/fipimomozuk/KjjHUid/download_freezero_mod_apk_home.pdfIn PDF document text
    • https://tojaxufuvubugo.weebly.com/uploads/1/3/4/6/134641466/2257452.pdfIn PDF document text
    • https://rofokaragi.weebly.com/uploads/1/3/2/8/132815015/69c303cd88952.pdfIn PDF document text
    • https://roralolew.weebly.com/uploads/1/3/0/7/130775143/netorunekir.pdfIn PDF document text
    • https://wutuzorul.weebly.com/uploads/1/3/5/9/135963099/b4e1127390f9021.pdfIn PDF document text
    • https://cdn.sqhk.co/gowamojon/jagh6jj/temarufuxumuju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419640/normal_5fe0c1e46d17e.pdfIn PDF document text
    • https://cdn.sqhk.co/gapebeve/WUImia3/rivij.pdfIn PDF document text
    • https://zeruwowigewal.weebly.com/uploads/1/3/0/8/130813736/kemuzotoposani_mekoto_libusodizefesed_lixenoziteb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458412/normal_60112add7c6d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483349/normal_5fcc08f20e9ea.pdfIn PDF document text
    • http://rowowevu.mypressonline.com/c_oops_advanced_interview_questions.pdfIn PDF document text
    • https://sijalafad.weebly.com/uploads/1/3/4/8/134887162/galipivusafi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05B 5532 bytes
SHA-256: 134e30d7c73c66e0e0a4f7bdfc2a16b1d607bd93b2da2ef248d7c3f086e9deb7
font_01_sfnt_off0001034a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034A 10516 bytes
SHA-256: 9f9550584dcbe425fd18db6f507b464b485188a931fe81049aed134bf7d51709

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