Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eaa86d93a19f816…

MALICIOUS

PDF

76.8 KB Created: 2021-04-06 07:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25f82f149358d331bf9ed537cd881f63 SHA-1: 14153dc74a666e030e06d34cbe67fd2f16af4e89 SHA-256: 7eaa86d93a19f816d1061354c761841c8fe9709112e6d824214d919eb95822c2
126 Risk Score

Malware Insights

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

This PDF file is flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable hosting services, suggesting a link farm designed to redirect users. The document body, though heavily obfuscated, appears to be a lure related to search terms, aiming to trick users into visiting these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://soxebez.ru/wix?keyword=young+goodman+brown+text+dependent+questions+answers
    • https://madoguwulivusi.weebly.com/uploads/1/3/0/7/130775056/9824985.pdf
    • https://pikoxujedogusu.weebly.com/uploads/1/3/4/6/134665618/8547080.pdf
    • https://cdn-cms.f-static.net/uploads/4474456/normal_6056228fb0b86.pdf
    • http://jajokojunewi.mypressonline.com/grammar_exercise_for_class_9.pdf
    • http://fiwisud.getenjoyment.net/social_emotional_and_moral_development.pdf
    • https://cdn-cms.f-static.net/uploads/4454430/normal_6034dedc291a3.pdf
    • http://lodubesemo.iblogger.org/8968803082.pdf
    • https://bipekafus.weebly.com/uploads/1/3/0/7/130776646/0993759.pdf
    • http://damodudajipofem.22web.org/61543799824.pdf
    • http://ruwegekugite.22web.org/58825386112.pdf
    • https://zademufexek.weebly.com/uploads/1/3/4/7/134765537/1323725.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://velefaluzi.epizy.com/sexibopofapur.pdf
    • http://fikenojidukozo.rf.gd/dinamicas_para_nios_de_catequesis.pdf
    • http://nazasasamuk.rf.gd/11140993844.pdf
    • http://zavizalovop.epizy.com/wagizomimodafasodatamadu.pdf
    • http://tetomor.rf.gd/54441788428.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_off0000ed51.bin
00d75b836ac2b0580a7e1ae61d99881c444442633281b43c7a2e508828d5f9a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xED51 5632 bytes
font_01_sfnt_off00010074.bin
e94aab55dc6320ca0f26948695aa190951c76c27223b2d5ebd87689b02c874f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10074 11308 bytes