Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e6bca9faf3c2a28…

MALICIOUS

PDF

80.2 KB Created: 2021-03-22 10:49:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 5fd92a4b0afa3db5ce1b43f045b21cef SHA-1: 57cf7b79e933d615ed284a5c4edba04d96719f71 SHA-256: 7e6bca9faf3c2a28396edb99f49c0f47613dc11633b360944b4b28482571e059
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic identifying it as a 'PDF_SEO_LINK_FARM'. The primary malicious URL, 'https://jacksth.ru/award?keyword=aldous+huxley+pdf+english', suggests a potential phishing or scam lure. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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=aldous+huxley+pdf+english PDF link annotation
    • https://wudatoguji.weebly.com/uploads/1/3/4/8/134885495/wiviwif.pdfIn PDF document text
    • http://yourbigdick.space/que_es_el_buzon_de_voz9d5ob.pdfIn PDF document text
    • http://xenogogumemikek.66ghz.com/dedesidoxugalefamajotovo.pdfIn PDF document text
    • https://sixagezox.weebly.com/uploads/1/3/1/6/131606695/1736452.pdfIn PDF document text
    • http://reduslim-ufficiale.website/70873887025igsso.pdfIn PDF document text
    • https://tewizoduwab.weebly.com/uploads/1/3/5/3/135341898/9974194.pdfIn PDF document text
    • http://alifan.store/688475502705pekg.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://03234a85-d811-4a68-a1f9-f7315bf9ccb2.filesusr.com/ugd/079591_5e379ef810af49e8bdfdc45e5757dc33.pdf?index=trueIn PDF document text
    • https://562a32fb-e9c8-4d8f-ac7e-a760da58c396.filesusr.com/ugd/68ec97_0daec8bc30b144eb98696ec2a14dc5fe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/pdf_bestanden_samenvoegen_acrobat_reader.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/baby_shower_invitation_templates_photoshop.pdfIn PDF document text
    • http://xupikilagi.rf.gd/lavasa_corporation_ltd_annual_report.pdfIn PDF document text
    • https://4c5ad993-366d-4b3a-aa99-9b6f56583180.filesusr.com/ugd/01e791_7b2f867f1c40431da921be13d92e1795.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nevowimo/xikolikuf.pdfIn PDF document text
    • http://fifajepetu.rf.gd/20345065175.pdfIn PDF document text
    • http://kuwajakuxoj.epizy.com/reaccion_antigeno_anticuerpo_aglutinacion.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/durizakemu.pdfIn PDF document text
    • http://wubujuf.rf.gd/wharton_case_book.pdfIn PDF document text
    • https://6a1e2a5f-c456-4288-b9d5-5378f87870fb.filesusr.com/ugd/076fac_726cdb362a6541e392606d1353502c11.pdf?index=trueIn PDF document text
    • https://6bb2b61b-82bf-473b-8365-63ddb02ddbdd.filesusr.com/ugd/d55797_627959630c1a4fd4b4e1d3680ca65c47.pdf?index=trueIn PDF document text
    • https://ecfc1f44-6648-4072-bff5-6ee4adcfbe4f.filesusr.com/ugd/e5a943_07c8399cbdf44202bef2cba6b347758e.pdf?index=trueIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_9b76daef1ac74503883f012c8125a657.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_off0000eef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF9 4956 bytes
SHA-256: 0e2fff8c76f58b3e85c59201784b71c80936d064342037c515ff0824a644657d
font_01_sfnt_off0000ffde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDE 11040 bytes
SHA-256: 9e3dc87815a057e09459c03f393ff53ed17138df407fd563eb62c514a155f34f
font_02_sfnt_off0001256e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256E 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71