Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6eb4ba05a61d0cb…

MALICIOUS

PDF

75.7 KB Created: 2021-05-31 20:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7bd46550a2d4f299916c2d2cd23e8f67 SHA-1: 9449161dbf38bda91025b5900f8ad9dd69b42b74 SHA-256: b6eb4ba05a61d0cbf639b038dbed46a937c75b466c0dcc95911f1969fc01b2d2
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a PDF link farm. The primary malicious URL identified is 'https://coretry.ru/pbw?utm_term=what+is+a+nice+word+for+n', suggesting a phishing or scam attempt. While no scripts were explicitly extracted, the PDF structure and the presence of external links indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://coretry.ru/pbw?utm_term=what+is+a+nice+word+for+n
    • https://bulasekujamur.weebly.com/uploads/1/3/4/3/134377464/746e5.pdf
    • https://cdn-cms.f-static.net/uploads/4449406/normal_602a2300137dd.pdf
    • https://cdn-cms.f-static.net/uploads/4468286/normal_601f11332ce36.pdf
    • https://zakekeru.weebly.com/uploads/1/3/4/5/134584110/8094ce98318d.pdf
    • https://tanipodolotuweb.weebly.com/uploads/1/3/4/4/134457000/watokuwilezesu.pdf
    • https://fafovufurivu.weebly.com/uploads/1/3/2/6/132695925/4053c342.pdf
    • https://nuzibekupin.weebly.com/uploads/1/3/4/3/134338080/vajenijiroka.pdf
    • https://galatowev.weebly.com/uploads/1/3/4/3/134325578/kakenotud.pdf
    • https://kovufevenisote.weebly.com/uploads/1/3/5/9/135981247/forurimiwuxaf-vakoruf-duvopekosozal-webanuk.pdf
    • https://mufogijagojar.weebly.com/uploads/1/3/1/0/131070489/kopowamafodok-sasitefa.pdf
    • https://static.s123-cdn-static.com/uploads/4419626/normal_5fdf47509ac59.pdf
    • https://xigowobil.weebly.com/uploads/1/3/4/6/134645495/seget_xosejovegije_jiwoluserinid_kukuximifol.pdf
    • https://cdn-cms.f-static.net/uploads/4447877/normal_5fd81cacc92eb.pdf
    • https://zuzufejalapo.weebly.com/uploads/1/3/4/6/134684928/9e6e63a6435e431.pdf
    • https://nudoguku.weebly.com/uploads/1/3/5/3/135306062/dulelewazojanat-vimabokevu-rubisaluxuzomo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lekipirunezi.pbworks.com/f/ipcc_standards_on_auditing_short_notes.pdf
    • http://rugewenuzed.pbworks.com/f/ccea_gcse_biology_revision_book_answers.pdf
    • http://tagexoba.pbworks.com/w/file/fetch/144423006/how_to_end_an_intercessory_prayer.pdf
    • http://nagomax.pbworks.com/f/dapenu.pdf
    • http://zepupifob.pbworks.com/f/88684247287.pdf
    • http://nunaruribeg.pbworks.com/w/file/fetch/144416139/lexisnexis_police_report_customer_service.pdf
    • http://mefijunov.pbworks.com/f/download_cheat_database_ppsspp_ppsspp.zip.pdf
    • http://jajafad.pbworks.com/f/wilowakasadur.pdf
    • http://mumasenekera.pbworks.com/f/tufuwoposela.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb15.bin
b4ef6aa6b8f52efd18673099b91dbff71e013c525db2f6d361469cf472b67dcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB15 5184 bytes
font_01_sfnt_off0000fcca.bin
6c1591359b6135674001f2b09f54970764bfad70375c4a9bdd6a32d19737bc74		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCA 10280 bytes

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