Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a2aa1c5ac46797e…

MALICIOUS

PDF

78.4 KB Created: 2021-03-13 14:43:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 30eef309a81529f3496a7bce55736b7b SHA-1: 9201e43a2dbde1dc67b3b276b789519e736de634 SHA-256: 8a2aa1c5ac46797ee49d3407634d0b05d13fc6a10e8f1e1e73dc02fe9e24e401
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 0.9992

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://jacksth.ru/strik?utm_term=starting+strength+program+for+seniors PDF link annotation
    • https://tezijetukiresu.weebly.com/uploads/1/3/5/3/135394197/wulevufanuduri_nabonilukefow.pdfIn PDF document text
    • http://dadivasim.sportsontheweb.net/kukevibejazapigenolupe.pdfIn PDF document text
    • http://korixipedur.iblogger.org/slumber_party_birthday_invitations_template.pdfIn PDF document text
    • https://supuzuvafexag.weebly.com/uploads/1/3/5/3/135383103/0c29cf348593313.pdfIn PDF document text
    • https://nekazadezi.weebly.com/uploads/1/3/4/6/134662300/zuketutub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413573/normal_601999985b500.pdfIn PDF document text
    • https://jizanisa.weebly.com/uploads/1/3/5/3/135386656/fuxokeso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495999/normal_5fd810049b4d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493876/normal_603b6f66672e0.pdfIn PDF document text
    • https://vesanawe.weebly.com/uploads/1/3/4/6/134602832/kivejunurizimu_vixafasejavo_suzovuvetu_padurupe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/programmable_logic_controllers_petruzella.pdfIn PDF document text
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_90908b7cdc524b02ac5d1879f480cfa3.pdf?index=trueIn PDF document text
    • http://jezesukawug.rf.gd/fraction_word_problems_year_3_worksheets.pdfIn PDF document text
    • http://soxomidil.epizy.com/sadijugokabukepuj.pdfIn PDF document text
    • http://saxodanokijaj.atwebpages.com/lebinagafijajupimut.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/kamabigegipibaminomuzasam.pdfIn PDF document text
    • https://7f06b679-e14d-4525-8955-d56a7cf6f710.filesusr.com/ugd/79e5df_ee940f6dad79497189c47233cfb5d69e.pdf?index=trueIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_ce2b9ab4ce274f87942a0b6eb368be49.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jexijer/13877020399.pdfIn PDF document text
    • https://s3.amazonaws.com/neporezofov/reporters_without_borders_internship.pdfIn PDF document text
    • http://zukomakiduw.myartsonline.com/sedentarismo_causas.pdfIn PDF document text
    • https://5b3500e9-40b4-440a-9ada-171ed8bcf4c9.filesusr.com/ugd/7820d0_85e1165eca774b8ca40d062cf76e7c78.pdf?index=trueIn PDF document text
    • http://nibuneb.epizy.com/wusotidem.pdfIn PDF document text
    • http://zudupaxub.myartsonline.com/89289982331.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/dekeb.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_off0000f4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B1 5388 bytes
SHA-256: 7a307f342f76516ff974a7e0b0e1015c18cae97d1c81aaa71f3a9d7336f55f06
font_01_sfnt_off000106e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E0 10944 bytes
SHA-256: 44ed03cb090e7eca2cc18a0719f8a87d54a58fd1de294401eb072378317aab01