Malicious PDF — malware analysis report

Static analysis result for SHA-256 990040d4754569a1…

MALICIOUS

PDF

78.9 KB Created: 2021-06-10 15:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 06372a7e43c636ea8df8e89c7fddf63b SHA-1: 3c4eee730dbc378365e7da6cffa586716e5ce1b7 SHA-256: 990040d4754569a11aaae86b3b2f36844a74f2c36fe4ad29935308ea92e75de3
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, including one pointing to 'crysiq.ru', which is flagged as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://crysiq.ru/pbw?utm_term=nursing+diagnosis+for+lethargy PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480182/normal_600a817d50bd0.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4474752/normal_60b21cbc121a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404755/normal_5fcb97b701496.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408471/normal_605f31bf86794.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366048/normal_60067fbd639f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457332/normal_6003b1cecc856.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467017/normal_60018ad705559.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418188/normal_604a368200ef3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448986/normal_5fd88dc29aadf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452607/normal_60bb30d464cb8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495400/normal_5fec6e389e1ed.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4366309/normal_60b550d967363.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451945/normal_5fd649e2c58db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409602/normal_5fdb7828deb38.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fodorafirig.pbworks.com/w/file/fetch/144432732/ranuroj.pdfIn PDF document text
    • http://kimotamiju.pbworks.com/f/is_sun_joe_a_good_pressure_washer.pdfIn PDF document text
    • http://jotoxipigi.pbworks.com/f/creo_3.0_download_with_crack_32_bit.pdfIn PDF document text
    • http://xexufokug.pbworks.com/w/file/fetch/144807525/munekixumapogezadiza.pdfIn PDF document text
    • http://nafidob.pbworks.com/w/file/fetch/144601062/conflict_desert_storm_3_pc.pdfIn PDF document text
    • http://xotokuwawa.pbworks.com/w/file/fetch/144699252/96561116035.pdfIn PDF document text
    • http://lorugaz.pbworks.com/w/file/fetch/144880512/managerial_accounting_garrison_16th_edition.pdfIn PDF document text
    • http://bamedun.pbworks.com/w/file/fetch/144568347/30143654606.pdfIn PDF document text
    • http://vedufid.pbworks.com/w/file/fetch/144568779/laxitakawe.pdfIn PDF document text
    • http://sozegajamuf.pbworks.com/w/file/fetch/144597405/when_christianity_started_in_europe.pdfIn PDF document text
    • http://vefubop.pbworks.com/f/what_are_the_types_of_police_misconduct.pdfIn PDF document text
    • http://jifesepapo.pbworks.com/w/file/fetch/144557709/treat_your_own_neck_robin_mckenzie_download.pdfIn PDF document text
    • http://vikowezanipe.pbworks.com/f/kujebekobamanizi.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_off0000f74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74C 5240 bytes
SHA-256: bde65baf4c2ce41f6ae2e19a8d3ec045f87fbcb8cdac3c5fb3b1a0e1bc64e814
font_01_sfnt_off00010923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10923 10840 bytes
SHA-256: d7f6182092887daca375fb792b08202c0233a0b945aac223b125595b6ddc18a5