Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fbc20eb71b86348…

MALICIOUS

PDF

76.4 KB Created: 2021-03-17 23:32:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 55eb20377e8f06cca34e5042a458039c SHA-1: b1b9e57e6ff4732bb53c2732c5a3692abccddcbd SHA-256: 2fbc20eb71b8634833bcd2c238ea2e0e484b7ef953fe5908076496de3810d0c6
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 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/wix?keyword=to+kill+a+mockingbird+chapter+23+summary+shmoop PDF link annotation
    • http://organicnu.info/53274372210tyiuf.pdfIn PDF document text
    • https://vitovoraf.weebly.com/uploads/1/3/1/1/131164311/bf47554.pdfIn PDF document text
    • http://stnold.com/southern_reach_trilogy_torrenth8txk.pdfIn PDF document text
    • https://wobelafesuta.weebly.com/uploads/1/3/4/7/134767333/4540397.pdfIn PDF document text
    • https://rurovipodi.weebly.com/uploads/1/3/4/0/134096689/b960660726.pdfIn PDF document text
    • http://best-ital.fun/dominos_birthday_party_package_sri_lankay4zkv.pdfIn PDF document text
    • https://xexigajusotojuz.weebly.com/uploads/1/3/1/6/131606060/senevosepeguluxebis.pdfIn PDF document text
    • https://gimiduti.weebly.com/uploads/1/3/4/7/134711596/4331622.pdfIn PDF document text
    • http://goproonly.com/best_low_calorie_drink_at_sonicnpr0z.pdfIn PDF document text
    • https://kaperimivegorew.weebly.com/uploads/1/3/4/3/134371305/5605592.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bf5f3f24-cfb9-4aec-9f01-83e6d863dc5b.filesusr.com/ugd/1f4526_f21a10edc8d14c369de64fdcd227e27b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c93dff0-db6d-49ae-b0ed-65cc84ae61a9/how_to_treat_anxiety_cbt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46802717-b789-49e3-a47e-679f3ddcc6b9/94550553349.pdfIn PDF document text
    • https://s3.amazonaws.com/kubedukowug/ishares_core_growth_allocation_etf_fact_sheet.pdfIn PDF document text
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_6da684d4c62745aa87fab43990f6fe1a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b694609-2efa-40c0-87c9-f052cfa7834e/how_to_reset_an_asus_router_to_factory_settings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80e458a7-2074-442d-9840-e9e189a2d238/were_ancient_roman_buildings_painted.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/88914726419.pdfIn PDF document text
    • https://b00f38ea-0d13-4519-ab0f-1253f0d03ca0.filesusr.com/ugd/289c5e_9f29c716e29240a9826647ed7a9032e6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/how_do_i_use_my_cuisinart_convection_bread_maker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39916ed7-4ef9-4136-bb00-d6b8ef9b0216/how_to_put_string_on_a_loom.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_off0000eaab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAB 6036 bytes
SHA-256: 859f55bb9ece88202b4e9514e1d0f53bfba0418228324455ee1038ea9090d88d
font_01_sfnt_off0000ff0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0B 10860 bytes
SHA-256: 5d0711c33ac4ada32d8d79bc84eaf6af5a37ad5f00c12fc9ace74fdaf4ff02bc