Malicious PDF — malware analysis report

Static analysis result for SHA-256 773da628a3f3163b…

MALICIOUS

PDF

79.1 KB Created: 2021-05-07 23:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 881fc0c6553ec0079a1d8fa565d80e2c SHA-1: de4c769e388cbdbc38ae7c4d7c81f98a51c205c3 SHA-256: 773da628a3f3163b20c934643577e08e30686749516b0c722a9ac4b9e3da53ab
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 0.9998

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://resalured.ru/strik?utm_term=baldur%2527s+gate+ii+enhanced+edition+character+creation PDF link annotation
    • https://cdn.sqhk.co/savadapo/hblijKI/bee_bot_starter_set.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425919/normal_5ff9e50ea2575.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420029/normal_6043422b78a3e.pdfIn PDF document text
    • https://cdn.sqhk.co/pegipoveridi/jdhijh2/facebook_portal_zoom_virtual_background.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454180/normal_603e851aac41b.pdfIn PDF document text
    • https://cdn.sqhk.co/jabuvilir/JACichd/36502933317.pdfIn PDF document text
    • http://xewixejixukumes.22web.org/50129282020.pdfIn PDF document text
    • http://karnaval.host/480789648804fo8a.pdfIn PDF document text
    • https://cdn.sqhk.co/podoxato/hf8ahaH/kibemigok.pdfIn PDF document text
    • http://7lessons.space/sandisk_sansa_clip_software_downloadblwg1.pdfIn PDF document text
    • https://cdn.sqhk.co/milevatomog/eHajaig/azur_lane_fleet_formation_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493917/normal_5fd79e90489a3.pdfIn PDF document text
    • http://furniture21.online/luvuravawoxelevitunumuva2zq6.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/1d3152f4-1f70-4ac3-901d-fedfac2da4bd/louisiana_protective_order_registry_forms.pdfIn PDF document text
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_1867694181df467eb1633e8cc08ca1c6.pdf?index=trueIn PDF document text
    • https://d1ee23ee-9ccf-45b0-80ef-1e1ff1f657c4.filesusr.com/ugd/9ef0c3_1171fb32f50346d5b04f7ab0217a9601.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/79c6a0f0-b4dd-4d91-952a-a3965cf96dc7/faxapemojazeni.pdfIn PDF document text
    • https://2f60c0de-bae8-48d8-8f3f-ce7907f87c52.filesusr.com/ugd/badafb_d8c2dfcaba0e4b09837895567ff81044.pdf?index=trueIn PDF document text
    • http://kusugafunerepo.rf.gd/kuvixanifa.pdfIn PDF document text
    • https://e966359d-176b-477a-9ad9-c314bea94227.filesusr.com/ugd/fa6f14_ebf6499677b94ba4915233bf69ccbd3d.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_off0000f731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF731 5284 bytes
SHA-256: f413a184c7b3920fb4a4a1941c095873eb7411811b54aecb6b8b12fc5700efc9
font_01_sfnt_off00010928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10928 10464 bytes
SHA-256: 588510a65bc1a7949595a763c4f2d7f8cc6e74b9f204c927df9f3ec2eed495bc