Malicious PDF — malware analysis report

Static analysis result for SHA-256 115a35fd96f96448…

MALICIOUS

PDF

75.5 KB Created: 2021-03-23 07:29:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 728b766371f86ff15031dc318e7d2ab5 SHA-1: 8c284aa2baa6a568537fb5eab781841b314d0769 SHA-256: 115a35fd96f964489c1289e47112ecd90f4df053bf9bdc2dcb78da6a20356afc
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant portion pointing to disposable hosting and exhibiting link farm characteristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were directly extracted, the PDF structure and URL analysis suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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.
  • 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://xezojetit.ru/strik?utm_term=compulsory+heterosexuality+and+lesbian+existence+review
    • http://gotexewadegu.iblogger.org/julius_caesar_modern_english_act_3_scene_2.pdf
    • http://setifol.66ghz.com/how_to_share_someone_elses_video_story_on_facebook.pdf
    • http://funogager.22web.org/bronchiolitis_guidelines_aap_2017.pdf
    • http://gatowixipeba.mywebcommunity.org/tumolawibopumujamuka.pdf
    • http://sweetygirl.club/zifesonolezuvawudajoximub5djtr.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nuruvapozixix/rawive.pdf
    • https://42e65457-ec34-4553-8979-78b6e302f774.filesusr.com/ugd/f1976d_87fe5d84214e4566a11db1824406fd08.pdf?index=true
    • https://95a57b4d-a24c-4412-bd87-88f4f885d252.filesusr.com/ugd/011e4b_eb0a64832d9d42038001a01fb25b1f5b.pdf?index=true
    • http://rarukerar.epizy.com/antibiotics_guidelines_2020.pdf
    • http://ritarejameja.epizy.com/fokawadozujavukumapon.pdf
    • http://tinejamuwaki.epizy.com/elevador_de_tijera_hidraulico_casero.pdf
    • https://1eba3b37-3dce-45e8-aa15-e51a58efc0fe.filesusr.com/ugd/89e37c_0a0c24af80154936b842d4a5dc2c4a7e.pdf?index=true
    • http://nigukeja.epizy.com/guidestar_nonprofit_report.pdf
    • http://pisonepegosa.myartsonline.com/25474630303.pdf
    • https://484a0fbd-04e0-416f-b335-41eb3f66808b.filesusr.com/ugd/228afb_14c50e03449e4e84a1a6251d99a11335.pdf?index=true
    • http://tamazodatitemi.epizy.com/59081699704.pdf
    • https://6e678f60-abc6-404c-883a-cd1729fdffee.filesusr.com/ugd/e4291f_cbd4afbe04dd40609e9c71375748a3e8.pdf?index=true
    • http://jitawidavez.atwebpages.com/nejebujezuluvuvaw.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_off0000e855.bin
95dccf538bf45218660bfa162353744377e0697325327e9bd0c554a0f0113db4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE855 5680 bytes
font_01_sfnt_off0000fb8c.bin
4621ffab0d83d586379efc12cfc02308a5970901dbc10271df1f33456bee5837		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8C 10876 bytes

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