Malicious PDF — malware analysis report

Static analysis result for SHA-256 551fd49ad2e3e270…

MALICIOUS

PDF

79.2 KB Created: 2021-03-21 00:44:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c969a7ca2b028159614bb2bdd1c0f570 SHA-1: 8e3122cd35ae56f4a555596e335ac2d3f401d8f2 SHA-256: 551fd49ad2e3e2706f1e6644dd71299a3043b6269a354fa8b2a9200ef9d37742
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm. The document body, though heavily obfuscated, appears to be a lure related to bread making, likely to disguise the malicious intent of redirecting users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/strik?utm_term=how+to+make+bread+in+a+west+bend+bread+machine PDF link annotation
    • https://cdn.sqhk.co/tixukiko/jhjh7ih/beat_swiper_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/kikolibub/oVVtZpJ/filalivex.pdfIn PDF document text
    • https://cdn.sqhk.co/febapaji/tjbhiMp/ice_cream_run_define.pdfIn PDF document text
    • https://tupusedaluniji.weebly.com/uploads/1/3/0/7/130738871/2415009.pdfIn PDF document text
    • https://xomowozijirogap.weebly.com/uploads/1/3/4/6/134667332/302810.pdfIn PDF document text
    • https://nusuwexob.weebly.com/uploads/1/3/4/3/134352417/dd3528a788a3a5.pdfIn PDF document text
    • https://pomisefinare.weebly.com/uploads/1/3/4/9/134902228/edbaf4bb8aa1.pdfIn PDF document text
    • https://kidenido.weebly.com/uploads/1/3/1/6/131636891/7719569.pdfIn PDF document text
    • https://tilotifibow.weebly.com/uploads/1/3/4/5/134505855/letijevu.pdfIn PDF document text
    • https://fajizaxaro.weebly.com/uploads/1/3/1/3/131381717/fedof_wapatexeribiten_binep_kofegezatubumu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d52b9e49-8cd2-4b78-a594-49a58aad7cf7/how_do_i_add_a_to_my_kindle_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd60c2a6-fb2b-4fe1-904a-231527c6ad09/31913774184.pdfIn PDF document text
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_803b804670cb4c5db3252897d48d6b54.pdf?index=trueIn PDF document text
    • https://ae8c1479-5121-4009-b0ed-8259dbb1205b.filesusr.com/ugd/0aff45_c9ef22b2533b4146a91b870d51ce2bbf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/47ec7972-b49e-418a-b7b3-662a4d842b6a/gezavuruku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b36a3f7-ac49-4e55-bfeb-a8aedbd8d1ce/ariens_24_compact_snow_blower_oil_change.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d3c96d9-f355-4d41-9078-9605657d231c/which_of_these_elements_has_atoms_with_the_largest_atomic_radius.pdfIn PDF document text
    • https://86146b48-cf95-488a-b5a0-22832f4589a6.filesusr.com/ugd/3b4eee_df664970bc2f4e28b428703d7d2b2d5f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/38dcbcac-70f5-4d9a-8bae-b63bdf60368f/sufipumatipisifojax.pdfIn PDF document text
    • https://c2dbac7f-2075-4dc1-ad03-af0d0352bff2.filesusr.com/ugd/278743_fcb041fd2cbb4a9681cdab5e27b39b64.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5242e5e8-b78a-4773-beee-918418f669b8/molecular_model_kit_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ff32663-41a0-41d9-9c47-48d851e8023c/23776356124.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b9a1582-d735-4e93-98b0-ea3026469500/lux_pro_heating_and_cooling_lever_thermostat_manual.pdfIn PDF document text
    • https://944456f3-75eb-4cd6-bbfd-656b3713ada1.filesusr.com/ugd/2c8d66_fbf9def9a860479d86adc016ad46d246.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_off0000f842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF842 5404 bytes
SHA-256: 89c46d055851f3f9b3b7a140f7cce2e7ab5273f546eefb1e964c2c20b2008427
font_01_sfnt_off00010a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A81 10588 bytes
SHA-256: cf8b7b68a309d1292eb968d54cc8faae3ae570b0267f2c9b7c3edd666fdfbbee