Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc71f90dfa2f2ebe…

MALICIOUS

PDF

77.9 KB Created: 2021-06-06 08:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 75f377f4e4ba4395d60f20fd7fc55b0d SHA-1: 2438f26975303767da9df53d7ad4883cf25cc89d SHA-256: fc71f90dfa2f2ebe90ad810699ee4c82640d94d17f0cf0c2a1dd33505e1fa6f5
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_LINK_FARM' and the presence of numerous unknown reputation URLs strongly suggest a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the nature of the link farm and the ClamAV detection as 'Pdf.Phishing.Trojan' point towards malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://allytemp.ru/pbw?utm_term=8+s%25C4%25B1n%25C4%25B1f+veri+analizi+test+pdf+e%25C4%259Fitimhane PDF link annotation
    • https://worivoka.weebly.com/uploads/1/3/4/5/134588103/2397101.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477164/normal_602b9a2b6cc60.pdfIn PDF document text
    • https://wolifejigejut.weebly.com/uploads/1/3/7/5/137512537/ximenikojugus_nawigabi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384295/normal_6064522ac4617.pdfIn PDF document text
    • https://vewufozokan.weebly.com/uploads/1/3/1/0/131071297/lisoxadig-zukefabovini-nowovuko-xokatunogepigem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422912/normal_603eb645ee23c.pdfIn PDF document text
    • https://togawikanow.weebly.com/uploads/1/3/5/3/135320583/zasufuxafimeturok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444370/normal_604fe84f500b9.pdfIn PDF document text
    • https://xukonupuzifig.weebly.com/uploads/1/3/4/6/134621954/2497273.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381291/normal_5fd2a0f605503.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427104/normal_604981185ef78.pdfIn PDF document text
    • https://nexolibevi.weebly.com/uploads/1/3/4/4/134463206/paveloseroxoj.pdfIn PDF document text
    • https://guvoruba.weebly.com/uploads/1/3/4/7/134742814/7073783.pdfIn PDF document text
    • https://beponelife.weebly.com/uploads/1/3/1/1/131164358/4691461.pdfIn PDF document text
    • https://jipaxebuperiw.weebly.com/uploads/1/3/4/7/134751602/258384.pdfIn PDF document text
    • https://jizimixu.weebly.com/uploads/1/3/4/0/134095846/fa425a0b07c2d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zabodovojif.pbworks.com/w/file/fetch/144426807/roblox_studio_download_ipad.pdfIn PDF document text
    • http://wotetidi.pbworks.com/w/file/fetch/144635682/smok_novo_manual.pdfIn PDF document text
    • http://wamotarirup.pbworks.com/f/57340543747.pdfIn PDF document text
    • http://dijakezepo.pbworks.com/f/lifetime_channel_on_spectrum_cable.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD3 5752 bytes
SHA-256: 8f2f96285352c3055cd5095e6c192e15f3c82160d65684dcfc1ff3f0ceb7eaad
font_01_sfnt_off00010150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10150 12548 bytes
SHA-256: 12ab4cf1ae4e28388109a391aea68e86e2eb65ac1cd260e70df37dd0a4bd813a

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