Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c1f7282002f43e7…

MALICIOUS

PDF

67.7 KB Created: 2021-06-02 10:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 74f23b197081109aa5619c39ddedd069 SHA-1: 7ca5046629c465ecf28fb2136bf3ee1aba491a24 SHA-256: 0c1f7282002f43e771a43808107e8550a662d23d35a3675e0afc83ec1991e039
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting services, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or further exploitation.

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://pistant.ru/pbw?utm_term=funcion+logaritmica+grafica+creciente+y+decreciente
    • https://gixinizolovuz.weebly.com/uploads/1/3/5/3/135348456/3320175.pdf
    • https://boxijobanopuvob.weebly.com/uploads/1/3/0/7/130739783/4015229.pdf
    • https://nobixerevogug.weebly.com/uploads/1/3/4/4/134481004/7218945.pdf
    • https://cdn-cms.f-static.net/uploads/4461786/normal_5fd1997511778.pdf
    • https://cdn-cms.f-static.net/uploads/4486548/normal_6024acf284d82.pdf
    • https://cdn-cms.f-static.net/uploads/4487416/normal_603126010e070.pdf
    • https://zixotojene.weebly.com/uploads/1/3/4/3/134315054/564415325ee3f.pdf
    • https://vumerajijo.weebly.com/uploads/1/3/2/8/132815742/newifi_tojovujozutin_sijajiwenenu.pdf
    • https://static.s123-cdn-static.com/uploads/4420600/normal_5ff442bd82c9d.pdf
    • https://dabagurujor.weebly.com/uploads/1/3/4/3/134350609/kufaxa_xenikixukodi_zelur_kexiwutu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xiwitanul.pbworks.com/w/file/fetch/144466809/problemas_sencillos_de_suma_y_resta_para_nios_de_cuarto_grado.pdf
    • https://uploads.strikinglycdn.com/files/69e491e1-de8f-4812-a134-29bc39bafaae/namelonutovuwex.pdf
    • http://litorabi.pbworks.com/f/totally_bath_tension_pole_shower_caddy_assembly.pdf
    • http://tarogifere.pbworks.com/w/file/fetch/144488490/cuales_son_las_10_enfermedades_ms_comunes_del_sistema_endocrino.pdf
    • http://biduzoku.pbworks.com/f/dusitojoravog.pdf
    • https://uploads.strikinglycdn.com/files/a3bea71c-2e54-4393-b38b-d0a3e82a9c9c/39978263082.pdf
    • http://zegugas.pbworks.com/w/file/fetch/144411456/10109408561.pdf
    • https://uploads.strikinglycdn.com/files/d2a3a3ab-2904-4ef5-8826-0bf2f49da22a/13682627444.pdf
    • http://genarozep.pbworks.com/f/jilunixare.pdf
    • http://viluxese.pbworks.com/w/file/fetch/144428652/seriwafoxagoxi.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_off0000cc61.bin
18baba7aca3e5aacf806ff48619e77f7529387a63a54e14899b986e973a45970		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC61 5220 bytes
font_01_sfnt_off0000de1e.bin
04cb3730d97f10042ee2c224f01c0308ad63c2010e70b49123c6735f005ffd66		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1E 10300 bytes

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