Malicious PDF — malware analysis report

Static analysis result for SHA-256 356265dc09955150…

MALICIOUS

PDF

71.1 KB Created: 2021-03-26 12:23:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b5a3c3c3752a03e83d22f116c179043d SHA-1: 87fb327d78fce51860b117e9b09ce25f25b41c57 SHA-256: 356265dc099551507da3e8419054941988c0497dd79e148d64d8fa09fa3e0873
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dafemum.ru/123?utm_term=sewage+treatment+plant+pdf PDF link annotation
    • https://cdn.sqhk.co/xerejijasoma/cNig3je/48750305837.pdfIn PDF document text
    • http://vadosixajobirug.mygamesonline.org/libro_el_cerebro_idiota_gratis.pdfIn PDF document text
    • https://cdn.sqhk.co/wixedineve/giKfia0/bilingualism_in_the_philippines.pdfIn PDF document text
    • https://cdn.sqhk.co/vedanoderifu/djgjbhi/zoditediwidibozab.pdfIn PDF document text
    • https://cdn.sqhk.co/sabimejuka/e0dZigd/93263992722.pdfIn PDF document text
    • http://retamos.mygamesonline.org/maxeg.pdfIn PDF document text
    • http://solokekojo.22web.org/spain_food_guidelines.pdfIn PDF document text
    • http://vitetoka.scienceontheweb.net/golizabajinulobawuvovez.pdfIn PDF document text
    • http://waxosasovan.22web.org/biology_of_belief_summary.pdfIn PDF document text
    • http://dodemul.mygamesonline.org/512640646.pdfIn PDF document text
    • https://cdn.sqhk.co/purawewus/jjjbD1Q/human_skeleton_puzzle_game.pdfIn PDF document text
    • https://cdn.sqhk.co/velizovatim/hjhiats/granny_and_grand_house_chapter_2_download.pdfIn PDF document text
    • https://cdn.sqhk.co/fopujetoros/haDBzq7/48117603500.pdfIn PDF document text
    • https://cdn.sqhk.co/dibitarebizu/MKhgfrV/xifibaxe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://geganom.rf.gd/mirezu.pdfIn PDF document text
    • http://bewaxupu.rf.gd/browsec_for_free_and_unlimited_vpn.pdfIn PDF document text
    • http://finuponazed.epizy.com/kokipowilewaruge.pdfIn PDF document text
    • http://mafekebokidodat.rf.gd/10618929224.pdfIn PDF document text
    • http://pijefekogol.rf.gd/brave_new_world_chapter_8.pdfIn PDF document text
    • http://ritikaju.epizy.com/bukunmi_oluwashina_movie_soundtrack.pdfIn PDF document text
    • http://jedigox.epizy.com/ansys_mechanical_tutorial_guide.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADE 5008 bytes
SHA-256: 86b04c8e947d595dc80e31f6225ef47d4641a91ca21049196dd4861cab46d765
font_01_sfnt_off0000dbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD7 11292 bytes
SHA-256: 4b247c1ca7d6970a24a6ccdc3bde22a0425740b5a6966dd4fbb42adcf8109fd8
font_02_sfnt_off000100fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FA 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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