Malicious PDF — malware analysis report

Static analysis result for SHA-256 b56b60d50d339421…

MALICIOUS

PDF

81.6 KB Created: 2021-05-11 09:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 81bfb216846427f58a322ab3e6f03c96 SHA-1: 8f6a7b439a410e0c16c461b3f60207d06755bcc8 SHA-256: b56b60d50d33942183c1889b236b5353a4f8d195fbc7fa4f79bfebda5b1594bd
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 0.9993

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://fokemale.ru/strik?utm_term=what+are+the+new+home+decor+trends+for+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390661/normal_605585bc0df3a.pdfIn PDF document text
    • http://larediwavokib.iblogger.org/carl_jung_red_book_amazon_uk.pdfIn PDF document text
    • https://sujujawajiz.weebly.com/uploads/1/3/5/9/135964945/womeni_mogev_repawagexirazuz.pdfIn PDF document text
    • https://wanibezitajijo.weebly.com/uploads/1/3/6/0/136000154/rizifefupik_buvobimij_tilisew.pdfIn PDF document text
    • http://rupekudufim.22web.org/android_app_development_for_beginners_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422906/normal_60016af31e2ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481056/normal_5fd27655cd604.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464851/normal_5fe9114b57ce1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382190/normal_5fc5f5655f221.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4407eba0-147d-4e9d-98ff-19010b67f466.filesusr.com/ugd/c1f2fd_09a794d2f3e242a398f6e0e488900ea1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/07f20388-52ef-4330-a864-549484ae4348/addictive_drums_2_complete_v2.1.9.pdfIn PDF document text
    • https://170a7d3c-74f0-42f5-9ead-98ae292a4922.filesusr.com/ugd/a18aa6_fb868b01751c469f95fd3f9b15166057.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a846731-0f76-42b3-8863-5db8a98296e7/lirokel.pdfIn PDF document text
    • http://mipumupo.epizy.com/meiosis_1_and_2_stages.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82e78d38-10e7-4bb9-b854-7757ad6f56b7/90101117734.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b46484d2-6ca6-40eb-a637-2d3d474bf36a/zowaxisabomigebisodetaze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d9fb27c-e63a-4b39-a549-1d454f073d9b/tone_of_poem_harlem.pdfIn PDF document text
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_e8f58601c02e434e98e095c152f42563.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d0520b0-d7ca-40f0-a19f-b90df8358218/how_to_pair_bluetooth_headphones_bose.pdfIn PDF document text
    • http://jabirazefizoz.epizy.com/marketing_plan_thesis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8de23329-cae7-4fb2-afda-03bf5c0f72f0/how_often_to_change_transmission_fluid_dodge_dakota.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdb1f483-c862-4bd5-8673-a9e67efd7149/how_to_start_a_successful_life_coaching_business.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98834462-818c-4ea7-ae1e-2c54c08c25b2/complete_krav_maga_manual.pdfIn PDF document text
    • https://c7bff75e-0a19-4817-9d47-fca4cf08161b.filesusr.com/ugd/3b6424_336b6ba981ad4b7d883a7250aea74561.pdf?index=trueIn PDF document text
    • http://bifelizebov.rf.gd/what_is_meant_by_kcal_mol.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_off000100fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FB 5608 bytes
SHA-256: cee3be28fafb960b307bea9d58f58d83f4601a00440066d83d63b5e67a177598
font_01_sfnt_off000113ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FF 10716 bytes
SHA-256: 6d63c8693d04b22802f8b114b2cf47d77248d4fa3e6b7cad409ff68635aab60d