Malicious PDF — malware analysis report

Static analysis result for SHA-256 53739303739d5a0d…

MALICIOUS

PDF

95.5 KB Created: 2021-05-25 05:41:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b76aa54574b7fc75a9bd3fff238cba0f SHA-1: 76f4dfb95d6215d5c32507a11687860ab5f390d3 SHA-256: 53739303739d5a0d3a0c6429b2f7b8c985408f84a6c57ab9adfe540dcf0a4fc1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, with one pointing to 'kuzutuzo.ru', suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains references to 'Goal.com live scores table', likely a lure to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/strik?utm_term=goal.com+live+scores+table
    • https://cdn-cms.f-static.net/uploads/4463560/normal_6048a8bf8f7fd.pdf
    • https://gavokafiwafez.weebly.com/uploads/1/3/1/3/131381231/xexakexisa-rexowirori-mabega.pdf
    • https://mitesevutij.weebly.com/uploads/1/3/4/7/134717039/2826038.pdf
    • https://cdn-cms.f-static.net/uploads/4446635/normal_604768d658766.pdf
    • https://cdn-cms.f-static.net/uploads/4448746/normal_60170ae1ebc0d.pdf
    • https://cdn-cms.f-static.net/uploads/4374843/normal_60196dba301ca.pdf
    • https://cdn-cms.f-static.net/uploads/4375531/normal_604f369f497f2.pdf
    • https://static.s123-cdn-static.com/uploads/4465565/normal_5fc59fc16ef69.pdf
    • https://cdn-cms.f-static.net/uploads/4450509/normal_602d07c2e4f2f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/luropiw/52743514548.pdf
    • https://s3.amazonaws.com/lupebesu/five_nights_at_freddys_game_unblocked_77.pdf
    • https://s3.amazonaws.com/kudowo/combine_like_terms_video.pdf
    • https://uploads.strikinglycdn.com/files/267ebc8b-077d-46b3-bf9f-9ec24c502882/mufabenikaruxageduxodej.pdf
    • https://uploads.strikinglycdn.com/files/0858c62c-5225-4d59-ba3d-7cd4f5b23402/55288841756.pdf
    • https://uploads.strikinglycdn.com/files/73f19e3e-69df-4590-bdbd-f766d4e1e864/is_potassium_nitrate_ionic.pdf
    • https://uploads.strikinglycdn.com/files/5407e005-02d6-49c9-90f3-97c0609f2fcb/fuzikim.pdf
    • https://uploads.strikinglycdn.com/files/21a60be5-e334-43c1-bf7d-f89d1b71a500/taxufoleba.pdf
    • https://uploads.strikinglycdn.com/files/b0f57802-8e1b-4b34-bfe9-52ceedbd4bb8/10188860439.pdf
    • https://s3.amazonaws.com/retobifulipo/essay_on_nationalism_in_india.pdf
    • https://uploads.strikinglycdn.com/files/89d8459f-0f68-481e-8612-2534fa628399/biodata_format_for_job_application.pdf
    • https://uploads.strikinglycdn.com/files/f0614e90-eb28-4327-a395-97186c10672c/68528749680.pdf
    • https://uploads.strikinglycdn.com/files/7cd685c1-45b0-4bd1-afd0-46d8d8ac4485/soxavitasowol.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_off0001363f.bin
4962815e10ef3907a25c6d41ecbbe23dca899f98cc617cda38d7f32800af6161
pdf-font-stream PDF embedded font (sfnt) at offset 0x1363F 5208 bytes
font_01_sfnt_off000147ed.bin
4ff12590afc06ff7d579638ff3fadbfc0e347df324a640e2f61bd82ff720d5b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x147ED 11852 bytes