Malicious PDF — malware analysis report

Static analysis result for SHA-256 450f8be9e9fd35d3…

MALICIOUS

PDF

89.9 KB Created: 2021-05-06 13:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d3b6a98fdb637f2663580a552a0b043 SHA-1: cd0964551988068f89ae65a66b27c7b4ee8cf101 SHA-256: 450f8be9e9fd35d3ce1ab921ea0459b5b1456b8ffa74691ce5a00ba1dcc643ea
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, which is a common tactic for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs suggests the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/strik?utm_term=supply+chain+management+mba+schools
    • https://cdn-cms.f-static.net/uploads/4454824/normal_60359baae0d19.pdf
    • https://cdn-cms.f-static.net/uploads/4401559/normal_603f6e7d5b538.pdf
    • https://cdn.sqhk.co/gozigawefo/eJhgthd/xufojiwebogu.pdf
    • https://static.s123-cdn-static.com/uploads/4406514/normal_5ff97c431d738.pdf
    • https://static.s123-cdn-static.com/uploads/4424996/normal_5fcd51e4b5ec9.pdf
    • https://cdn-cms.f-static.net/uploads/4453551/normal_6052e5dc27594.pdf
    • https://cdn-cms.f-static.net/uploads/4463526/normal_602240568d672.pdf
    • https://cdn.sqhk.co/jabosuve/hgjhY7Q/webatixokutuluwadow.pdf
    • https://cdn-cms.f-static.net/uploads/4454303/normal_603e7e816880a.pdf
    • https://static.s123-cdn-static.com/uploads/4495999/normal_5fcb7af91f5bd.pdf
    • https://cdn-cms.f-static.net/uploads/4460983/normal_5fe8291e44bc9.pdf
    • http://jofifuneku.medianewsonline.com/tijisakulibolu.pdf
    • http://kexawez.mygamesonline.org/caida_del_imperio_romano_resumen.pdf
    • https://cdn-cms.f-static.net/uploads/4365584/normal_6050d3db7de42.pdf
    • https://cdn.sqhk.co/sowodopevew/74heic1/accuradio_mellow_smooth_jazz.pdf
    • https://cdn.sqhk.co/zedawuzijis/1JTjf10/world_war_z_2020.pdf
    • https://cdn.sqhk.co/zegofurop/cHxuiaf/milkshake_recipe_easy_pineapple.pdf
    • http://pozufopajosel.mypressonline.com/corporation_bank_demand_draft_form.pdf
    • https://static.s123-cdn-static.com/uploads/4387929/normal_60019d2fa4775.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://54570836-76ea-4100-b78f-d1ba4c3cc0d1.filesusr.com/ugd/21ac59_1528deaa42f541c8b34fa37574c957df.pdf?index=true
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_9066cdf7adca4667996b6722d2eb2095.pdf?index=true
    • http://xezaretidatoro.onlinewebshop.net/dobunasatipa.pdf
    • https://a97cc435-ef8e-4ffb-8544-4b9c0bda5a6e.filesusr.com/ugd/7ab440_eb64221b13e244069412666611b2c0ff.pdf?index=true
    • 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_off00011ef7.bin
9e0e1334ce4aecf643604425de59e534f098dac81b4c1d261a6be95d3813851c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF7 5596 bytes
font_01_sfnt_off000131df.bin
dbc898c4af177609d4281a78f3ff5c0560639c349f41e75eea6a64c40d8777c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131DF 11808 bytes

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