Malicious PDF — malware analysis report

Static analysis result for SHA-256 4529f90bac3ea2df…

MALICIOUS

PDF

84.3 KB Created: 2021-05-04 01:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1ea69b34b18e624336f955852b8213c3 SHA-1: 200cc7d24b411306a055ffcdaa288d713bc72f9b SHA-256: 4529f90bac3ea2df617b98384bdcedaae3d52d1ec4fa6eaa225b55b266ac706f
244 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as search results for book recommendations, but it redirects to malicious infrastructure. 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 embedded links are indicative of a phishing lure, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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/strik?utm_term=what+are+the+best+books+to+read+for+12+year+olds In PDF document text
    • https://cdn.sqhk.co/pedidagow/hhfthha/xotibatumolifaxifigu.pdfIn PDF document text
    • https://cdn.sqhk.co/febowozefu/XSXjigd/medarolulumixofaje.pdfIn PDF document text
    • https://cdn.sqhk.co/sawusuzi/0L5gdhi/oracle_forms_11g_weblogic.pdfIn PDF document text
    • https://perikoweb.weebly.com/uploads/1/3/5/2/135297066/4125019.pdfIn PDF document text
    • https://lidafeli.weebly.com/uploads/1/3/4/6/134683499/tejig.pdfIn PDF document text
    • https://cdn.sqhk.co/fivufotimad/iSm1heH/dinosaure_new_best_hd_4k_wallpapers.pdfIn PDF document text
    • http://centerverifybadge.com/bob_omb_battlefield_alto_sax_sheet_music1lfxe.pdfIn PDF document text
    • http://hayatevesigar.online/chevy_express_van_performance_parts33zmm.pdfIn PDF document text
    • https://vixixufabajuwe.weebly.com/uploads/1/3/1/1/131163632/majunek.pdfIn PDF document text
    • http://pc-remont.website/moniciones_xxii_domingo_tiempo_ordinario_ciclo_cxzvbz.pdfIn PDF document text
    • https://cdn.sqhk.co/mumesimasozo/jjw1Lhc/15044685343.pdfIn PDF document text
    • https://muwikoli.weebly.com/uploads/1/3/2/7/132740525/robopuv.pdfIn PDF document text
    • https://netigobulon.weebly.com/uploads/1/3/4/0/134096742/tarola-tepaladimivad-miluj.pdfIn PDF document text
    • https://tojumemi.weebly.com/uploads/1/3/1/3/131379390/20e8ea265a53546.pdfIn PDF document text
    • https://cdn.sqhk.co/zalenemu/fihYFic/70962866132.pdfIn PDF document text
    • https://sobuxiba.weebly.com/uploads/1/3/4/8/134867950/bujufazur.pdfIn PDF document text
    • https://cdn.sqhk.co/jifigetuxu/dFOiwx1/30476441370.pdfIn PDF document text
    • https://cdn.sqhk.co/wupifufexix/1jb1Lig/nujimedura.pdfIn PDF document text
    • https://cdn.sqhk.co/nobipajami/vjaKhfg/ninjago_season_12_trailer.pdfIn PDF document text
    • http://milansit.space/shudra_the_rising_review642ar.pdfIn PDF document text
    • https://zokokemakate.weebly.com/uploads/1/3/1/4/131454090/ed75a1243080c6.pdfIn PDF document text
    • https://konomotawet.weebly.com/uploads/1/3/1/3/131379362/mogegawijajozog-wudavowutetejot-lifuduxozi-damaluregekabo.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
    • https://3f46bf15-0a8c-4e80-b3e5-a2e3bf90e008.filesusr.com/ugd/8e6e76_9c850a0cd4c348ab8fa59c56856ef953.pdf?index=trueIn PDF document text
    • https://c4e42e93-254c-4ba8-b495-737f84002742.filesusr.com/ugd/ddb60a_728cf9f9368e4c24878f313ffc2cd0ff.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC62 5132 bytes
SHA-256: 1627002fb16b11a87ee52d0e96d7aac7f1a32a456b76cadc601284f4742982d6
font_01_sfnt_off00010e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E02 11332 bytes
SHA-256: 41f08c3dbe09010f18e2ffb15843bec8ce296ca62995a36a41922f69e4c91e78
font_02_sfnt_off00013356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13356 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3