Malicious PDF — malware analysis report

Static analysis result for SHA-256 17bb428f0c384b2c…

MALICIOUS

PDF

75.3 KB Created: 2021-04-29 02:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: fb171d90d8caacafc95fb4222989b9f7 SHA-1: 2e1b1dc9bd2f33384fe65cb60dfbce4013e4226b SHA-256: 17bb428f0c384b2c37fc58afd8f86973389ba093015ba19d0d92e1997193d397
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing campaign. The embedded content, though heavily obfuscated, likely serves to direct users to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://bologen.ru/strik?utm_term=how+to+work+abs+on+cable+machine PDF link annotation
    • http://gatowixipeba.mywebcommunity.org/boy_in_striped_pajamas_gas_scene.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/47e03c8b-09f2-4da3-a0f7-1cd7f5b733f1/why_is_als_difficult_to_diagnose.pdfIn PDF document text
    • http://xovefopu.myartsonline.com/55721259434.pdfIn PDF document text
    • http://topufopotu.epizy.com/free_sheet_music_for_clarinet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e497dee8-3a7d-4512-877d-82895f162a5f/white_rodgers_1f80-361_manual.pdfIn PDF document text
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_b5f68a3e3f334cb4a7e387fadfc63858.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b47d5cc-2400-479f-99bc-054742a9ce79/makutowo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0034b04-c2cc-48af-b20a-9b35f1d40b05/mixed_practice_proving_triangles_congruent_worksheet_answer_key.pdfIn PDF document text
    • http://tinasixubu.epizy.com/4718673182.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d4e2297-7504-4049-b34b-51a6d420cab4/los_5_lenguajes_del_amor_download_free.pdfIn PDF document text
    • https://50037ee0-0691-4a53-bdc2-b2f8f795cfa6.filesusr.com/ugd/b41a9a_412e202a5fa9468d9a102264170fe796.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/xagukorodiwojerokenepop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c26dec02-6b92-47a5-8000-58b8b5a0f011/salems_lot_stephen_king_summary.pdfIn PDF document text
    • https://f89b8795-a90f-4359-81e0-6309601a98d9.filesusr.com/ugd/8e7730_11c4b6b2584e4d0fbc5d815b387891e9.pdf?index=trueIn PDF document text
    • https://488a161d-122f-4e25-b35e-34d1d0e27b34.filesusr.com/ugd/bbc910_570cd985d16b4b9b984528d33f97ff5d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/ninja_professional_blender_1100_attachments.pdfIn PDF document text
    • http://mevumum.epizy.com/bupegumekexat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3b607db-058b-4734-9ed4-75276f8c6a3c/kejujomemasurugox.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/balalafuwu.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/kuxilepido.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56303303-794f-49a5-95b8-2a2caf72c030/27278264266.pdfIn PDF document text
    • http://xubedoper.epizy.com/wetelofewabifuxasativuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66a4c46d-ab68-467e-af8d-385c8d847266/cooler_master_haf_912_price.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/8103512045.pdfIn PDF document text
    • http://nufiwimuzobo.onlinewebshop.net/do_front_airbags_deploy_rear_end_collision.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_off0000ea17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA17 5296 bytes
SHA-256: 04eb292a2d8d4e88a72ca2f5e3fdac9fb8814eb0d06b0ec54edfa8c8c976e7ab
font_01_sfnt_off0000fbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFC 10388 bytes
SHA-256: 1e4d04fad8fd09c98505d3210550bedf4ffa7b6848f0ba1be162e5d623e121c2