Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f1c493144dafd18…

MALICIOUS

PDF

82.9 KB Created: 2021-03-24 16:21:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: cbfc850ddc5d5b6a5afee9b9d379f0fa SHA-1: 19208a948df3dc73ef47b61263c9bdcc5ed89f2a SHA-256: 8f1c493144dafd18368e84850f533a28d7b2483367223b8a7408227a1d65303f
156 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 0.9997

Heuristics 5

  • 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.
  • 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://dugedepap.ru/123?utm_term=free+wedding+guest+list+spreadsheet PDF link annotation
    • https://buriviniroxino.weebly.com/uploads/1/3/1/6/131606563/6f5540e1.pdfIn PDF document text
    • http://rijoginijamibeg.mypressonline.com/basic_pencil_drawing_techniques.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370985/normal_5fd8b9ecde22a.pdfIn PDF document text
    • http://moxawunanenubop.sportsontheweb.net/plant_virology_5th_edition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372737/normal_602adaf24a1eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422392/normal_60436486b093a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413976/normal_5fedfbbc41d96.pdfIn PDF document text
    • https://mafewesoxadix.weebly.com/uploads/1/3/4/6/134697647/7350965.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://memepev.myartsonline.com/adding_and_subtracting_fractions_with_like_denominators.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/zajikamunojizer.pdfIn PDF document text
    • https://s3.amazonaws.com/murudute/robert_k._yin._2014._case_study_research_design_and_methods.pdfIn PDF document text
    • https://s3.amazonaws.com/xowasosuf/ccna_1_answers_final_exam.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/luxuvezudojifulupimeboni.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/jagokodutojodarutuvofug.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/pygame_for_python_2._7_64_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/mueller_report_podcast_lawfare.pdfIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/91678699616.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/83835390226.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/nidimerusori.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/gmail_inbox_folder_android.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/coastal_geomorphology_book.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_off000105b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B4 5268 bytes
SHA-256: ca4ee2118556077743a4647f532a2a915ea32075034638c0ba936af8a14237da
font_01_sfnt_off000117b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B0 11444 bytes
SHA-256: 8aabd4cf0d87d694aa465e6f5a734a57c7294df55253a505fcc4027fc893fc7f