Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a2e04e385cdfb0…

MALICIOUS

PDF

112.2 KB Created: 2021-03-23 15:21:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 40db3d18abbbdc4b491b23ccaa7f42da SHA-1: 10fec7847ac9920894b1dc7121f8d50ba5e0b44f SHA-256: b4a2e04e385cdfb0728b12692955165bece68f651132f46a4d357908db316d38
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://baarspo.ru/123?utm_term=bhakti+songs+tamil++free PDF link annotation
    • http://wosurijegu.22web.org/autogenous_shrinkage.pdfIn PDF document text
    • http://bajifepeselok.sportsontheweb.net/energy_audit_report_of_hotel.pdfIn PDF document text
    • https://sinekagu.weebly.com/uploads/1/3/4/8/134855021/jufomafepatudu_bidef.pdfIn PDF document text
    • http://vuvopogawuxaxax.22web.org/bixonin.pdfIn PDF document text
    • http://shopsupergood.site/73065809399vwcbv.pdfIn PDF document text
    • https://ramemegu.weebly.com/uploads/1/3/1/3/131383760/e23109c9d.pdfIn PDF document text
    • http://nasufulorejuwe.mywebcommunity.org/tasunupavibuxojis.pdfIn PDF document text
    • http://jitokinut.iblogger.org/congenital_neurological_disorders.pdfIn PDF document text
    • http://vobalemujumojak.mywebcommunity.org/nigerian_worship_songs_lyrics.pdfIn PDF document text
    • http://pshcomonhere.xyz/wedding_crashers_2005_hindi_dubbed_300mbw1oeh.pdfIn PDF document text
    • https://gatepeduvemixif.weebly.com/uploads/1/3/4/6/134669895/galim_molodelo_vazelu.pdfIn PDF document text
    • https://zimivopup.weebly.com/uploads/1/3/1/3/131381614/zuroletufuwoxodave.pdfIn PDF document text
    • http://tipijijajofupi.sportsontheweb.net/dejunazakuxuja.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
    • https://uploads.strikinglycdn.com/files/527f225d-4d5d-475f-bf95-297363770a48/list_the_four_characteristics_of_all_living_things.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c29e3f5a-fdbf-4a08-9144-025917cdd64b/cost_to_install_garmin_430w.pdfIn PDF document text
    • http://muliwavanebebo.onlinewebshop.net/sir_walter_raleigh_history_of_the_world.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17058 5080 bytes
SHA-256: 77b7d69443afb55dce40cb1cb24c5f0c6611aa4711256da7a315c2da93253587
font_01_sfnt_off00018164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18164 10840 bytes
SHA-256: 9d850859107388200160b2cb4f3b9871a16e706076137317277e7ef6eaa34aad
font_02_sfnt_off0001a636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A636 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333