Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b9cee82c1229fc9…

MALICIOUS

PDF

76.7 KB Created: 2021-03-31 12:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 252fe1b87496928bda63a78313c41214 SHA-1: b886ee9f106c7781ef02f7c68bb59b30aceb2ded SHA-256: 3b9cee82c1229fc9386da59ba1b3c9fdb7a20ae09adf506a6467dbc4c241a270
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 0.9998

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://seumenha.ru/123?utm_term=aoe++full+version+for+free PDF link annotation
    • http://banolapisa.iblogger.org/giwerogedafarobute.pdfIn PDF document text
    • http://forajadafogaxuv.medianewsonline.com/gladys_aylward_book.pdfIn PDF document text
    • http://wei-nmvc.com/719962979606g2y6.pdfIn PDF document text
    • http://cherrypimp.online/runescape_bronze_smithing_guideof48c.pdfIn PDF document text
    • http://vafutixon.22web.org/bowflex_pr1000_for_sale_used.pdfIn PDF document text
    • http://salestore.pro/pagalixk483.pdfIn PDF document text
    • http://rufoferapavinew.medianewsonline.com/zotefubukewik.pdfIn PDF document text
    • http://vanimerukaguto.scienceontheweb.net/nubune.pdfIn PDF document text
    • http://zoguponuwuxoli.medianewsonline.com/xumilol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://surobufalinaxis.epizy.com/celestine_donkor_agbebolo_lyrics.pdfIn PDF document text
    • https://12350a4d-732a-4148-85a7-4fa27f2a77ec.filesusr.com/ugd/17beed_8abd831ceed64bc18c67c73e2bd17c5b.pdf?index=trueIn PDF document text
    • http://gijenuja.epizy.com/sql_server_2008_database_management_studio.pdfIn PDF document text
    • https://7605d98d-8b17-4a41-9383-f5c8d5af9bcc.filesusr.com/ugd/2bed4c_20c94b68d64549b98316c6f1aa61b4c8.pdf?index=trueIn PDF document text
    • http://wonumamirevaz.rf.gd/adding_mixed_numbers_worksheet_vertical.pdfIn PDF document text
    • http://rereroma.epizy.com/suvafibevamevaxomuba.pdfIn PDF document text
    • https://b89c0965-50b5-483f-b67e-52f573158f4f.filesusr.com/ugd/1e222e_c8ad7fb4811d4f03949783e1daf4a7e0.pdf?index=trueIn PDF document text
    • https://4095172d-bd2f-4181-91d7-dd424e653400.filesusr.com/ugd/df73ab_7dda7724b29c4b4384fe0a6748f4860c.pdf?index=trueIn PDF document text
    • https://bcbc83ff-a82b-4234-bf1d-c69e8cae54d5.filesusr.com/ugd/057c82_bcc50e32307d442bb3732615eb413b5a.pdf?index=trueIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_0ad27c8febc24be9a943bbd9e92287eb.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A0 4400 bytes
SHA-256: 642cf144c8d6b710c7aff39f174b50cc8d6478bd570a300b715287b960d0007a
font_01_sfnt_off0000f0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A0 11416 bytes
SHA-256: 3e6b35fa0e819da3910f1e5e51d9ea3a3587292ba8ef7868dbaa3e5d7ffe74d5
font_02_sfnt_off00011771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11771 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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