Malicious PDF — malware analysis report

Static analysis result for SHA-256 e90024cd621078a5…

MALICIOUS

PDF

76.8 KB Created: 2021-05-10 03:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 16704ecd00fb46c818f1ac234ac1e55e SHA-1: 6a3eb4850e8d1a1766cd49842ad4a810133599a0 SHA-256: e90024cd621078a5b787faa25d61f7aff692c430c3a55f011cdd7dbf6e4e3f32
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or SEO spam campaign. It contains a mass of external links, many pointing to disposable hosting, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The primary malicious URL identified is https://zajinet.ru/strik?utm_term=lowrey+piano+review.

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://zajinet.ru/strik?utm_term=lowrey+piano+review PDF link annotation
    • https://cdn.sqhk.co/zoxogatuv/YebjbHY/snake_mania_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kufiremikaf/dh9gehh/castles_of_burgundy_solo_variant.pdfIn PDF document text
    • https://cdn.sqhk.co/kurafuso/Rghiehd/digital_marketing_manager_job_description_naukri.pdfIn PDF document text
    • https://cdn.sqhk.co/wusosekame/ibjh6jh/buxesunevubidepuluzu.pdfIn PDF document text
    • https://cdn.sqhk.co/gusiloxi/GM2gdia/best_3d_archery_targets_2019.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_cb50f590b14540139461579b3d946e40.pdf?index=trueIn PDF document text
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_e472efa37e834b1e9118e8d2e91e342f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c816899-b3ff-4438-8eeb-b7ed3830123d/what_if_netflix_trailer_deutsch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29f741a3-59df-4e62-bf02-bc41c86f0f9e/how_to_connect_directv_remote_to_directv_box.pdfIn PDF document text
    • https://7ed1f289-57d1-4e2a-9ee4-b64e0eb498cf.filesusr.com/ugd/13dc0c_aeeaa4bec47546ada31588fde778bafd.pdf?index=trueIn PDF document text
    • https://9eff4bf0-55a5-42b9-a65a-250f23c32afd.filesusr.com/ugd/80978b_9143763276f740c8bc3ca95973be81e5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa2b87bf-529d-4c72-86fe-c2da1e2ea266/what_is_the_best_ventless_washer_dryer_combo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13aaedfe-4776-4add-b64b-79ebbedd6cf2/used_2013_lexus_rx_350_for_sale_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9533b53-acb7-4e9f-8a3d-f2c77a0d24ea/sample_treasurers_report.pdfIn PDF document text
    • https://7f3dc8b3-869c-44c5-82eb-14ae88d57796.filesusr.com/ugd/dc4ca1_090f005701ed4ac794aa55674040abd6.pdf?index=trueIn PDF document text
    • https://f3b8d348-8566-49c9-a9f8-a2c3b9e1bc8e.filesusr.com/ugd/f1c748_751db9f3122d494481d9a67504260b4c.pdf?index=trueIn PDF document text
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_f48ca5f17c1447348eb3b8cdb0f7a3d4.pdf?index=trueIn PDF document text
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_976d4c3452da497681f6d2e947a57069.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2e36304-14c2-4d76-a668-15113f987372/honeywell_vista_20p_add_user.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8372e1ae-b447-4e0e-991b-0a7317d11d6a/to_the_woman_i_once_loved_free_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b61db9fb-166a-4a34-9c9b-2a19ba9560dd/dd_battle_map_grid_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e5286f5-4aaa-4bce-89a3-c283fa226446/guzuwegosemibulusat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20c14426-3a9f-4b22-a90b-febccc35e3ad/wing_chun_near_me.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_off0000f18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18E 4800 bytes
SHA-256: d14465465bb33ecfe30739a9a7ec004f0ef3d89308b2b3ff97e2f9c12fda1398
font_01_sfnt_off00010212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10212 10736 bytes
SHA-256: bd6155e3b53c2172b73e0bd34447d7f195e666b0c022d1c8f2bdef2265a3d6c0