Malicious PDF — malware analysis report

Static analysis result for SHA-256 101127d0f407a43e…

MALICIOUS

PDF

76.0 KB Created: 2021-02-15 15:51:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9e48d52ed716ec27bc3bbdc324a16559 SHA-1: 5dba4ae7dc1bef337a16778f47fcdb2c1962b746 SHA-256: 101127d0f407a43e55fe42e1e36e737d607118b7375ea0569917db99af5aeac9
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one prominent URL pointing to 'jacksth.ru', suggesting a redirection to a potentially harmful site. The PDF structure and the presence of embedded links indicate it's designed to lure users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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/strik?utm_term=what+is+manufacturing+process+in+mechanical+engineering PDF link annotation
    • https://zedimubaxujejit.weebly.com/uploads/1/3/4/7/134715534/6374913.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365602/normal_601a022cc2539.pdfIn PDF document text
    • http://wersita.fun/adidas_yeezy_500_utility_black_restock_datefmggd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443341/normal_60243404b9d02.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366344/normal_5feb256c12ed2.pdfIn PDF document text
    • http://kulixebuvalafin.iblogger.org/mofatalesikonitaba.pdfIn PDF document text
    • https://kifesajisibak.weebly.com/uploads/1/3/4/8/134884742/kogas.pdfIn PDF document text
    • http://zerkalo-fugicar.website/tuberculosis_cenetecngg39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413373/normal_6028f35161312.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411481/normal_5fcfa37e37169.pdfIn PDF document text
    • http://2gusevshop.space/zumdahl_ap_chemistry_9th_edition_answers0wo32.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469640/normal_5ff238ad85b39.pdfIn PDF document text
    • http://mozujana.22web.org/desugudowesitadinekezug.pdfIn PDF document text
    • http://nubolutlion.xyz/fybcom_banking_and_finance_notesqtz6f.pdfIn PDF document text
    • https://nuzozixajalupik.weebly.com/uploads/1/3/0/7/130739607/5413245.pdfIn PDF document text
    • https://xutepodufolesik.weebly.com/uploads/1/3/0/7/130739265/mawiwilopirunidud.pdfIn PDF document text
    • http://netewe5.xyz/gioteck_vx_2t88ra.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447658/normal_5fe2e7c836eaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387918/normal_60088ec0191a4.pdfIn PDF document text
    • http://vumavotanumibuv.iblogger.org/fiocco_allegro_sheet_music.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tinodaxaxaduj.rf.gd/sajotujiturelifezovivuvuw.pdfIn PDF document text
    • http://nosikugabuvisal.epizy.com/pharmaceutical_biochemistry_books_free.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eacd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACD 5444 bytes
SHA-256: bbbe136a7d760ef49ac9e405cfa088691bfe00b5902f5df15eb41c991ac32e4a
font_01_sfnt_off0000fd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD36 10860 bytes
SHA-256: 528ae082f8fa7487fc362a9c9b9015f9b8176292a049accaeb80c489bce1a93f

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