Malicious PDF — malware analysis report

Static analysis result for SHA-256 de7c77bb667f02b0…

MALICIOUS

PDF

77.8 KB Created: 2021-03-31 06:42:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f4e08ec030121f6f2cfbfe7361d8579b SHA-1: 21cb3d5d80a7ef9cad2b81c6dd6ae326ff2792df SHA-256: de7c77bb667f02b00bc5f89cf3f52ea1207172f49c9e4c18d31546852c33751d
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, and also detected by ClamAV as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable hosting, forming a link farm. One critical heuristic indicates a link to known malicious redirector infrastructure, suggesting the primary purpose is to lure users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=what+is+metaphysical+anatomy In PDF document text
    • https://vimedijo.weebly.com/uploads/1/3/1/6/131606629/111b235fbb2c2.pdfIn PDF document text
    • https://vawevoza.weebly.com/uploads/1/3/1/4/131482963/mojixuxobinil.pdfIn PDF document text
    • https://mapetafuje.weebly.com/uploads/1/3/2/7/132741207/2386441.pdfIn PDF document text
    • http://femusawar.iblogger.org/cisco_sg300_factory_reset_default_ip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486033/normal_6003eae810649.pdfIn PDF document text
    • https://gogabaxada.weebly.com/uploads/1/3/4/8/134852864/kenusegexuxak.pdfIn PDF document text
    • https://bigufoxorifef.weebly.com/uploads/1/3/1/8/131871864/kesifijutara.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426820/normal_601afa28151e8.pdfIn PDF document text
    • https://barurusijibipek.weebly.com/uploads/1/3/0/7/130740419/3800103.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378379/normal_602ac0b184f3a.pdfIn PDF document text
    • https://nedamekiwuj.weebly.com/uploads/1/3/1/3/131379605/6d24aed5caa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383923/normal_60432f3ef17d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486548/normal_605412af221d5.pdfIn PDF document text
    • https://kiwiwutirove.weebly.com/uploads/1/3/4/7/134707888/kijut_garunoni.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wumekupewug.rf.gd/ars_poetica_miosz.pdfIn PDF document text
    • http://debalipusafuj.epizy.com/ananda_vikatan_archives.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8583a123-60fa-4a58-b3ed-f849fee5d249/tivaterajukupamajafopope.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7339da8b-a80b-49a0-9411-11a5f151d142/27369986837.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8328df7a-732b-45ab-bb6f-f670222cc5ad/xejadapisezokeb.pdfIn PDF document text
    • http://godemesefiw.epizy.com/cahier_des_charges_pour_dveloppement_informatique.pdfIn PDF document text
    • http://vipenugixegun.epizy.com/erosion_control_measures.pdfIn PDF document text
    • http://diwiludoki.rf.gd/zawik.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE703 4980 bytes
SHA-256: b26bfc9d1e319877c4508261561d592076c0ab70ccc4d08431ad1da042fd001e
font_01_sfnt_off0000f7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D9 10516 bytes
SHA-256: af9c36f9ba4ea6cee5fd5b1bbd6ccbda64b6869c93b591dc9a64ed1b660986bc
font_02_sfnt_off00011bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB3 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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