Malicious PDF — malware analysis report

Static analysis result for SHA-256 25920436c9f4e7ef…

MALICIOUS

PDF

79.0 KB Created: 2021-03-28 22:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d5c23de950cbaf38093e87ab61c7375a SHA-1: 9ab68fa48ecf251b6e758662bce5cd915773030a SHA-256: 25920436c9f4e7efb4285f3ad08b8334bff9da2aa06027d10944a79747cf536e
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 0.9964

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://crophysi.ru/wix?keyword=progress+monitoring+tools+for+vocabulary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472491/normal_6015550711b3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485435/normal_601a008c2f1b0.pdfIn PDF document text
    • https://gurelupukuji.weebly.com/uploads/1/3/0/7/130775622/potopuk-taturuwu-lomewafoju-vijop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481830/normal_603e551e50da5.pdfIn PDF document text
    • https://bazamafew.weebly.com/uploads/1/3/4/0/134016738/5793076.pdfIn PDF document text
    • https://wokiliga.weebly.com/uploads/1/3/0/8/130814475/6437004.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469355/normal_5fe8276d7e4d5.pdfIn PDF document text
    • http://littlenat.space/archicad_22_30067yv33.pdfIn PDF document text
    • http://guviwogorusux.iblogger.org/31312468718.pdfIn PDF document text
    • https://jurulekoteg.weebly.com/uploads/1/3/4/7/134700509/levuj-xaramika-velumikesesiku.pdfIn PDF document text
    • https://xogukozatakik.weebly.com/uploads/1/3/1/4/131453421/kejoxopebafofofipasi.pdfIn PDF document text
    • http://iglivesupportteam.com/display_7_segmentos_2_digitos_datasheetw0yu9.pdfIn PDF document text
    • http://vitedotom.iblogger.org/28003481364.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498348/normal_60478521662ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428341/normal_5ff81c87ec83d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447270/normal_5fed5f8e9315e.pdfIn PDF document text
    • http://afracheat2.xyz/hp_compaq_8000_elite_sff_release_datel22q6.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/cisco_meraki_dashboard_user_guidexal6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477638/normal_5fd9f5282539d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xesewopalokix.epizy.com/21747188679.pdfIn PDF document text
    • https://a2214900-82f6-4ed5-a432-d5ffd14110fa.filesusr.com/ugd/306b6b_e134e0d44ed04fc38262796036e85488.pdf?index=trueIn PDF document text
    • http://xawunivirufoz.epizy.com/1953109377.pdfIn PDF document text
    • https://5c06e36d-e6a7-492f-989e-88f86e9ca1b1.filesusr.com/ugd/c9ae65_d49346f60d274390b9bdca49daef3617.pdf?index=trueIn PDF document text
    • https://bf5f3f24-cfb9-4aec-9f01-83e6d863dc5b.filesusr.com/ugd/1f4526_87eda70bed404936aa1c8cb7d0735a12.pdf?index=trueIn PDF document text
    • https://436010f1-0dd7-4950-aec0-3bdf337573e8.filesusr.com/ugd/5a4c69_226d30345ca447a186aed91601d6d75c.pdf?index=trueIn PDF document text
    • http://wosepejodobedaf.epizy.com/tesavog.pdfIn PDF document text
    • https://25cf7bc6-226b-4013-96fa-c64d334b7dac.filesusr.com/ugd/317e1a_efadc18c70e344d6a9714c079e91e386.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF502 5504 bytes
SHA-256: 37c2447153e6aa567e6fc771d0ba6372ceb0eefe46df1e092beb69d3a1df6573
font_01_sfnt_off000107bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BD 11328 bytes
SHA-256: b18a0dd04a509cdbcb036d710609230881fa0897abb303d16b0f3dfa033c28c0