Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfaba5cf2bd82e55…

MALICIOUS

PDF

88.4 KB Created: 2021-04-01 18:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7db30b8701c03a0ab3bfdd0ec1472ce0 SHA-1: 59d0e3f4c897f66022a748f807a392c447a20b02 SHA-256: dfaba5cf2bd82e552d21b3651fbc7e043cd16d2c08e8aad58bf748231a882e7d
186 Risk Score

Malware Insights

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

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 0.9993

Heuristics 6

  • 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 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://resalured.ru/aws?utm_term=what+is+design+verification PDF link annotation
    • https://gotenalonas.weebly.com/uploads/1/3/4/3/134372716/5604011.pdfIn PDF document text
    • https://leduzurukidep.weebly.com/uploads/1/3/4/8/134858842/vatogam.pdfIn PDF document text
    • http://timujisifatex.22web.org/california_paid_leave_of_absence.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450514/normal_60304c39adbca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460981/normal_604a8b0ed88c1.pdfIn PDF document text
    • http://bapupozizevose.22web.org/import_csv_file_into_excel_template.pdfIn PDF document text
    • https://lenopeseku.weebly.com/uploads/1/3/4/0/134040497/ac9273b3167f3.pdfIn PDF document text
    • https://rizowowomupi.weebly.com/uploads/1/3/4/3/134344214/xunidotonabib.pdfIn PDF document text
    • https://rovupugefo.weebly.com/uploads/1/3/4/3/134359584/bulivi.pdfIn PDF document text
    • https://wubedalenab.weebly.com/uploads/1/3/1/3/131383767/rivizepif_rumad_fiwusugurux_rudoxafom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423148/normal_5ffb817e23b14.pdfIn PDF document text
    • https://degujipimisa.weebly.com/uploads/1/3/1/4/131453395/jozege.pdfIn PDF document text
    • https://nopewiviguzine.weebly.com/uploads/1/3/1/1/131164125/227654.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475997/normal_601ac493387b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449395/normal_6001db7203971.pdfIn PDF document text
    • https://pigukoziluluz.weebly.com/uploads/1/3/4/8/134896600/638431.pdfIn PDF document text
    • https://siselujasukoju.weebly.com/uploads/1/3/0/9/130969984/tiwokajubeleke.pdfIn PDF document text
    • https://woxavadegiw.weebly.com/uploads/1/3/4/9/134902916/jezegawegowuxitoze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9d50af6f-dbf7-41ba-b854-83985329a12b.filesusr.com/ugd/33c377_d0a8c629d0d849a19948e0bd30019bf7.pdf?index=trueIn PDF document text
    • http://falogivaxaf.epizy.com/walus.pdfIn PDF document text
    • https://25cf7bc6-226b-4013-96fa-c64d334b7dac.filesusr.com/ugd/317e1a_56d6a114559349829adf060b78108176.pdf?index=trueIn PDF document text
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_46e93a7119e7400fb3d1409ff40645a6.pdf?index=trueIn PDF document text
    • http://somujewod.rf.gd/briggs_and_stratton_190cc_lawn_mower_oil_change.pdfIn PDF document text
    • https://b4e79a3f-0083-4b26-8056-4fe87fb46dfd.filesusr.com/ugd/332c1b_161e2ac98af646b883b8c7fc8a1d8e7c.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11868 5324 bytes
SHA-256: 8292687df58f07d377877d10f30804bb4ceaf61400c08854f2abe075cb358358
font_01_sfnt_off00012a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A90 12300 bytes
SHA-256: 137f37f47e52029c183031c51c345586aa77532b1bfa5d15600744bd8ec8cecd