Malicious PDF — malware analysis report

Static analysis result for SHA-256 a380fc9a29b5b86b…

MALICIOUS

PDF

71.4 KB Created: 2021-01-10 05:07:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 15947cea28abf05e12dd733c54cafcf4 SHA-1: d9390b3a951f7718a4c2e2f9e0654ee341e1be05 SHA-256: a380fc9a29b5b86b18ce1865573c93e696d7dafe573d8a2010388a8f7ef18c04
194 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external links, many pointing to disposable hosting services, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded JavaScript likely facilitates the redirection or download of further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://trafficel.ru/123?utm_term=ac+performance+test+firestone PDF link annotation
    • https://site-1177862.mozfiles.com/files/1177862/best_slayer_master_for_hellhounds_osrs.pdfIn PDF document text
    • https://site-1172486.mozfiles.com/files/1172486/friedrich_single_packaged_vertical_air_conditioner.pdfIn PDF document text
    • https://zupavuzinopaz.weebly.com/uploads/1/3/4/2/134265708/3733073.pdfIn PDF document text
    • https://cdn.sqhk.co/kezixowog/Ufegdie/ginezojozupoduluja.pdfIn PDF document text
    • https://cdn.sqhk.co/pixisuja/iIjbT8E/1727981483.pdfIn PDF document text
    • https://lijupumo.weebly.com/uploads/1/3/4/4/134496400/viwakupipim-pebupov-muwerijavulepuw.pdfIn PDF document text
    • https://site-1172367.mozfiles.com/files/1172367/79062985163.pdfIn PDF document text
    • https://cdn.sqhk.co/bewiviki/Spxjjhb/58844810803.pdfIn PDF document text
    • https://vijejomikozo.weebly.com/uploads/1/3/4/6/134668467/jogebuneke.pdfIn PDF document text
    • https://cdn.sqhk.co/wejagamewo/fijjac8/stickman_karate_movie.pdfIn PDF document text
    • https://site-1172900.mozfiles.com/files/1172900/zizujinapezimavibuxavali.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/muxukojerokitisotep.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/2014_cadillac_ats_2._0l_turbo_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/xowasosuf/fallout_4_creation_kit_without_launcher.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_off0000db7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7F 5116 bytes
SHA-256: 69e414b88b12af3996b93ac3b1b0e473a297b56059dbadc655fefccb1714789c
font_01_sfnt_off0000ecd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD1 10440 bytes
SHA-256: 2ea80057aa6026abe1c10250458d943da3073007c8e4e970d887612aca34dd72

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