Malicious PDF — malware analysis report

Static analysis result for SHA-256 6015ac7058dbc359…

MALICIOUS

PDF

78.8 KB Created: 2021-03-29 06:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c7772c9807a75ad7affbac7dcae39581 SHA-1: 52af7131bc59ffc445e573e763072f7eae3e07cb SHA-256: 6015ac7058dbc3598ed4ec004f6482f971f7c4855b13fbbb9998fa05a2fe9626
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://jacksth.ru/award?keyword=use+of+computer+in+medical+laboratory+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383334/normal_604ae606ed751.pdfIn PDF document text
    • http://docita.fun/wixekanopizalatr7sj.pdfIn PDF document text
    • http://sallehq.xyz/78362999121cv1kx.pdfIn PDF document text
    • https://cdn.sqhk.co/wujejelot/GZieig2/dream_daddy_craig_capybara.pdfIn PDF document text
    • https://cdn.sqhk.co/vugomupuzisa/HMia1gi/scary_sound_effect.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403264/normal_6012151627493.pdfIn PDF document text
    • http://copyrighytsupport.com/wakhra_swag_song_pagalworldqhq9s.pdfIn PDF document text
    • https://cdn.sqhk.co/powirafawume/ijhhhjd/bixewotelifojuraxuniduw.pdfIn PDF document text
    • https://cdn.sqhk.co/wigatozaduw/Hgjgdgh/45154364511.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408330/normal_5ff61da2a0e8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409093/normal_6038c8f6c0510.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383922/normal_5ffe737d06bef.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/kyhapCb/ankush_raja_new_hd_video.pdfIn PDF document text
    • https://cdn.sqhk.co/zogowefu/1sihiaT/90177566152.pdfIn PDF document text
    • http://filemarker.store/how_to_make_a_tied_fleece_blanket_youtube7a04e.pdfIn PDF document text
    • https://cdn.sqhk.co/kelopifagisu/3Ti26a7/custom_gun_simulator_3d_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://55963656-6eb1-4b25-bcd5-bb835d65808b.filesusr.com/ugd/0064ae_69d524eab0794389a014b4e78d1b7219.pdf?index=trueIn PDF document text
    • http://guxovirukezibo.epizy.com/tesla_model_3_performance_0-60_times.pdfIn PDF document text
    • http://vufagemabon.rf.gd/descargar_agenda_escolar_2020.pdfIn PDF document text
    • https://cfff6b0e-fc0f-4d9c-a983-c0e60c8b2bfd.filesusr.com/ugd/c637e3_38e198a2a9c54b4894451b4bbf3d4096.pdf?index=trueIn PDF document text
    • http://sitojedakolotil.rf.gd/salekutugakufipujiwox.pdfIn PDF document text
    • https://15e12281-0fef-4bb1-b284-2b61ddec1698.filesusr.com/ugd/6c5390_3ac8c1c5dffc46bea81a0ffdd5f1cdca.pdf?index=trueIn PDF document text
    • https://a179b4bb-f9e1-4b0b-8685-f881d2afde68.filesusr.com/ugd/0fdb6d_740f5d7876a84a6893af9b2bb14ea434.pdf?index=trueIn 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_off0000f6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CC 5532 bytes
SHA-256: cd09a4d0a23493bc702d3263a98ab0acc13b1b10d6064fc5df1a024bf80fc40c
font_01_sfnt_off0001098b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098B 10472 bytes
SHA-256: 7aa9672bfb1d38890734a66987a8069f1b1a067ee53e40bb0e991171b05c2742