Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c128f66ea1ff504…

MALICIOUS

PDF

91.3 KB Created: 2021-03-17 17:56:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f828a414d65b11919a0ba8d5031511c5 SHA-1: 45efdf0143b7bea7adc34f6159790e5247afee5a SHA-256: 8c128f66ea1ff5048f4b261b12f1d3bfe482aa0b4eb49f02c1ad098b052d2d43
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The PDF contains a large number of external links, suggesting it is part of a link farm designed to distribute malicious content or phish users. The embedded URLs are likely used to redirect users to malicious websites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/wix?keyword=beginnings+and+beyond+10th+edition+chapter+3
    • https://cdn.sqhk.co/lorotukogof/aSgghiP/eggplant_combat_boots.pdf
    • https://jumolemema.weebly.com/uploads/1/3/4/8/134853288/8104192.pdf
    • https://xuredetinumimo.weebly.com/uploads/1/3/4/6/134630251/dupidirok.pdf
    • https://cdn.sqhk.co/gelowidabik/aw2vHhP/forgotten_realms_calendar.pdf
    • https://cdn.sqhk.co/baxijaxazixi/BulgdgS/defense_career_institute.pdf
    • https://mokekisinuru.weebly.com/uploads/1/3/4/3/134366850/bbd1e14766c.pdf
    • https://razamilijukiw.weebly.com/uploads/1/3/4/8/134879964/15d13ef74869.pdf
    • http://wowitaly.pro/romupaliz9a6r8.pdf
    • https://cdn.sqhk.co/lawafopugu/D4Eogjd/falezunukovuvajiredonuxek.pdf
    • https://cdn.sqhk.co/negolura/ITmhfje/facebook_lite_apk_version_2016.pdf
    • http://fiwosumidixopij.iblogger.org/chandamama_balamitra_stories_in_telugu.pdf
    • http://palitra-cveta.ru/differential_pressure_transmitter_installation_guideeroya.pdf
    • https://jexelokase.weebly.com/uploads/1/3/5/3/135321670/7268110.pdf
    • http://uspehdnyaaxyz.xyz/kohler_marine_generator_parts_manualslcgg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/19527071-e396-4a43-8e21-7c3805e500c7/jobuvobodajavusazoniv.pdf
    • https://uploads.strikinglycdn.com/files/f8d5c85f-8dd6-41f1-8211-720dc36b6829/what_is_the_most_potent_acid.pdf
    • http://widurema.epizy.com/cbse_class_12_maths_question_paper_2020_16.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_off000124a8.bin
af1ebfcb16c46bed83316c1e4bdbdb329643851b2c7866ee4b22d1d7529c0b92
pdf-font-stream PDF embedded font (sfnt) at offset 0x124A8 5952 bytes
font_01_sfnt_off000138f6.bin
368e3c3f2e1c0d4b87d5f00dfd32ca10ae730f66339b25627d4a4a739a4697ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x138F6 11364 bytes