Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec078198bb99e44…

MALICIOUS

PDF

85.4 KB Created: 2021-04-04 04:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: f070c41587e9a6acb448b1229f478247 SHA-1: 5b53895f56db2e9d238ed4d7d980a5f08f8d741a SHA-256: dec078198bb99e442dcf124ff8362f846370237997e4c181fc43673c89787787
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://jottigo.ru/wix?keyword=greenhouse+effect+and+global+warming+worksheet+answers PDF link annotation
    • http://tebapewulodafe.getenjoyment.net/jorge_luis_borges_alef.pdfIn PDF document text
    • https://puvukiroleta.weebly.com/uploads/1/3/1/4/131455247/wozedoxobavep.pdfIn PDF document text
    • http://xufuzema.sportsontheweb.net/geluvatoxipaberasamane.pdfIn PDF document text
    • https://dufelawukada.weebly.com/uploads/1/3/2/6/132682042/ee7ce2b39e7d.pdfIn PDF document text
    • https://xolisibi.weebly.com/uploads/1/3/4/4/134462635/3056495.pdfIn PDF document text
    • http://bapatavusirave.mygamesonline.org/how_do_you_reset_an_lg_refrigerator_air_filter.pdfIn PDF document text
    • https://fasorijaj.weebly.com/uploads/1/3/4/5/134501708/punuviwusudemiwetebo.pdfIn PDF document text
    • http://boforotaje.mywebcommunity.org/subway_map_nyc.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/5b205801-0abc-4f8b-b38d-33fed55cb6ae/tcp_ip_protocol_suite_ppt_slides.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00237ca1-8b10-4c04-91f8-1d58e9123ed1/47350173559.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc7d3af5-3da3-45ec-b23c-4806c846924a/ramotovexanezuruputo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2c33928-a2a6-4bb1-9a5e-2605a3e47eaf/lomuza.pdfIn PDF document text
    • https://9cf5cc10-3c2e-4e30-ae6b-73ed7beed88a.filesusr.com/ugd/5c2b46_c7e25f1ad8c24d9cae4a062e141ceb72.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d559b44-d639-4425-8f68-219447785171/in_pursuit_of_god_the_life_of_a.w._tozer.pdfIn PDF document text
    • https://88749095-6fd7-453f-8e8a-15b48fe47dd1.filesusr.com/ugd/e4d7df_67376fabc322448187e1e897a606e75f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/066ce4c8-94d7-49ca-a48d-3036fe36753a/zuxiradonunuvefaxiko.pdfIn PDF document text
    • https://a1359116-1358-4cde-afc5-3600b4bb50db.filesusr.com/ugd/3b0c81_0cb2e05ca52e4d38baddc1e2ec4d6a61.pdf?index=trueIn PDF document text
    • https://2ddf8be6-044d-4f30-b6fd-16c032829cd6.filesusr.com/ugd/9827ea_4d3fc10277354514b5a3a5b1987ef2b2.pdf?index=trueIn PDF document text
    • https://34ea5197-a9e9-4ba5-99bb-a7dd7aeba98b.filesusr.com/ugd/234f58_8602321e214e40228b1aab5b60219c65.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcee0b93-ee49-446c-8f96-f9bc400ebd45/how_to_connect_plantronics_headset_to_dell_laptop.pdfIn PDF document text
    • https://c18d9829-3add-4afa-bc87-35007fe3998a.filesusr.com/ugd/70c1ec_398c2cc670824c37abe3dae54f0ed0cf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c741e912-a877-49ac-900b-9eb1f872d706/what_type_of_government_system_does_russia_have.pdfIn PDF document text
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_6fcfe36f895144d59a7cbca12ca0367b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/315ca504-5137-4cf5-9527-1c4836dab9bc/doctor_who_scripts_season_3_episode_8.pdfIn PDF document text
    • https://e668d0bc-6b9c-4787-ac64-5363b724ef62.filesusr.com/ugd/6ec699_0792c3709e374c04aee0e9b4e4794235.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f62cdfb8-f3da-4a5b-8bef-ff907bdee016/what_is_manual_page_break_in_writer.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_off00010e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E52 5760 bytes
SHA-256: 824ddfa354d38b623a7653a050b48a7f90990e94f34fa95f4e4d47f78c515be5
font_01_sfnt_off000121db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DB 10832 bytes
SHA-256: 357c3e6f593d8f16f4dd154e50ec3de642a4c136dde60db6e3b8bccd980c2788