Malicious PDF — malware analysis report

Static analysis result for SHA-256 52195d4a3a53bdab…

MALICIOUS

PDF

78.4 KB Created: 2021-06-04 01:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6d4f43ee9229d9b93ed16d79cff57a58 SHA-1: 1cd9e7d87bd1ad60d4d5954143bf35c2d306226c SHA-256: 52195d4a3a53bdab60f25d4b57cd1112ca02763a3a2653ac6d3e791813c32e16
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 0.9991

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://dugedepap.ru/123?utm_term=itau+empresas++pc PDF link annotation
    • https://wujipomazoki.weebly.com/uploads/1/3/1/3/131384492/c8eb0bd8.pdfIn PDF document text
    • https://vurabagugodemox.weebly.com/uploads/1/3/1/1/131164039/pamofofijo.pdfIn PDF document text
    • https://mibelovo.weebly.com/uploads/1/3/4/6/134608705/1684517.pdfIn PDF document text
    • https://valezofijamope.weebly.com/uploads/1/3/4/4/134445284/podewavozo-bumufuginega.pdfIn PDF document text
    • https://tokoposejod.weebly.com/uploads/1/3/1/3/131380771/nebanajanumik.pdfIn PDF document text
    • https://kexiwiwimibip.weebly.com/uploads/1/3/1/3/131379584/xijevapi.pdfIn PDF document text
    • https://bisubobotikimix.weebly.com/uploads/1/3/1/4/131438323/ratez_rumuletedun.pdfIn PDF document text
    • https://vemewibikem.weebly.com/uploads/1/3/0/7/130776349/kesiseragabo.pdfIn PDF document text
    • https://paduxadoduxim.weebly.com/uploads/1/3/0/7/130775016/biwasifozemof.pdfIn PDF document text
    • https://teraludejos.weebly.com/uploads/1/3/5/3/135304334/lafusifem_bufibil_gozilin.pdfIn PDF document text
    • https://majuzifulanapu.weebly.com/uploads/1/3/4/8/134887757/4b5a48d2010e.pdfIn PDF document text
    • https://wonimigapikil.weebly.com/uploads/1/3/7/5/137509794/12d20.pdfIn PDF document text
    • https://xafinuwexedigu.weebly.com/uploads/1/3/1/3/131379324/6476838.pdfIn PDF document text
    • https://wazelekur.weebly.com/uploads/1/3/4/3/134322050/nevivotaz.pdfIn PDF document text
    • https://torevoxun.weebly.com/uploads/1/3/2/7/132712334/6b98ca2a70.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/c3da1fbc-4aae-48cc-9bf6-8d5903a0827a/how_much_do_emts_make_in_maine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c72e764e-24d4-4975-bbb4-a1bb054cb100/lorell_clock_60998_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/111019bb-189b-4300-a9c1-70712fe79316/joining_the_conversation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/333dec7e-1caf-4cc5-ae72-72006143e5a6/58820155873.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40919f85-7c08-4fb4-88c0-38cada5b0c6f/arris_modem_tm822_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b32eee7-c7df-41a5-835b-babbb15a7c65/diablo_3_ps4_multiplayer_offline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/075f587d-3704-4295-9591-14ecdf5c2542/zubuzifaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d77f41f-dd8f-4c17-8709-bc46af11043a/xopakujowoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/039e032c-a3a9-4303-ac06-840680e84337/romeo_and_juliet_act_1_scene_4_study_guide_answers.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_off0000f292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF292 4984 bytes
SHA-256: 8e4c3689ed29163b79bddfef71e5131ad24f423249bd261d3665b79520f684b0
font_01_sfnt_off0001036f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036F 12588 bytes
SHA-256: 5f969bc12ed26dba669568d7daf9a9eba13454857cbaaa9f1188ead16fd673f8