Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7b157d01ff6f40f…

MALICIOUS

PDF

76.0 KB Created: 2021-03-19 21:38:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef69ebc1e5468a7eafea2fb50428b5bc SHA-1: 6a64e7cdf146bb4905e4406a55b140c1f99bc9fc SHA-256: a7b157d01ff6f40fade3624330a4ad516a77f5b0cbdfe2ff9ab6227e7f6dd043
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, characteristic of a link farm designed to improve search engine rankings or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful content.

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://lozipotod.ru/wix?keyword=october+sky+questions+answer+key+pdf
    • http://folupebop.22web.org/fuzurovobotunufak.pdf
    • https://tiralilibixadu.weebly.com/uploads/1/3/4/5/134500138/susozobawe-wuvujesumizet-gesusewuxi-duradiko.pdf
    • https://zugufirit.weebly.com/uploads/1/3/1/1/131163535/wiwovidudin-bofel.pdf
    • https://zemabata.weebly.com/uploads/1/3/4/6/134677216/319986.pdf
    • https://zekorawuj.weebly.com/uploads/1/3/4/8/134862422/luxone.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://siwodonodefofo.epizy.com/53791444978.pdf
    • http://gewopebij.epizy.com/calculus_by_hughes-hallett_gleason_et_al_7th_edition.pdf
    • https://s3.amazonaws.com/biwubeleba/21814525856.pdf
    • https://8d2868a3-57b7-484c-81f6-493c1c4f5daa.filesusr.com/ugd/a8ca0f_b3ea4852b6a14061972b9d1e3a877508.pdf?index=true
    • http://dasufolizimifub.rf.gd/what_are_the_different_types_of_war_poetry.pdf
    • http://sepuxukejobome.epizy.com/excel_vba_dim_sheet_as_worksheet.pdf
    • https://s3.amazonaws.com/divexikav/58043584900.pdf
    • https://s3.amazonaws.com/pivetuzadujo/powimavajanuniwo.pdf
    • http://nitiparavedo.epizy.com/best_voice_reader_for_windows.pdf
    • https://s3.amazonaws.com/rurovikejigibu/free_powerpoint_templates_for_middle_school.pdf
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_90bec8bf81ac47029fd47e5a830f9464.pdf?index=true
    • http://sonasekofuxix.rf.gd/bt8600_answer_machine_not_working.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_off0000ea6c.bin
8139cf12575f63cd54456781ef2f4507e0057914f7262e77d95d5d218fdcd1bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6C 5668 bytes
font_01_sfnt_off0000fdd5.bin
45577a52c8866446889d7d36d786b7f58b1dc3e8e895a611e4b938786a98b195		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD5 10936 bytes

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