Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7d134b8a4727a67…

MALICIOUS

PDF

81.7 KB Created: 2021-04-07 14:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c85478c2afaa0b8464f3599cffb9db97 SHA-1: 4599373eb91fc6003d39f03157550782b76ad109 SHA-256: f7d134b8a4727a67fcccf7a04a9a32b923d86636c8f6189d655c2a64765b26c6
186 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It functions as a link farm, containing numerous external URLs, with one notable URL being https://golowaki.ru/strik?utm_term=eliphas+levi+tetragrammaton+pentagram. This structure suggests the PDF is designed to redirect users to potentially harmful websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://golowaki.ru/strik?utm_term=eliphas+levi+tetragrammaton+pentagram PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4390330/normal_5fdd905f7afa9.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwetebep/aUIRPii/centro_business_planning_tool.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459787/normal_6051758ed164e.pdfIn PDF document text
    • https://cdn.sqhk.co/lexelinowe/h6YcRia/artificial_intelligence_stocks_to_watch.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528260/normal_60171790f0ece.pdfIn PDF document text
    • https://cdn.sqhk.co/besogevipadi/aZAKhcg/my_boy_gba_emulator_apkpure.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372735/normal_603c56c9b6658.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://9c3086b9-336b-4a4d-b39c-975a2563a2e0.filesusr.com/ugd/f4f792_09558ea614ef48669fb4531bfe5b22fe.pdf?index=trueIn PDF document text
    • https://5b2b9875-3923-4577-9ef6-0527498c95e7.filesusr.com/ugd/4e6dd5_78457d4487c5458b8e41a06b02c335c8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec3d8b9a-7c40-4b92-8113-0e5304ed835d/what_does_the_date_on_a_first_alert_smoke_detector_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea6e98d3-e4d6-49c7-9392-a63705d52346/segejopubiluvomiti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7c8d0d2-5784-4070-a191-ae29478e7a97/best_online_graphic_design_courses_free.pdfIn PDF document text
    • https://ac614e2c-2e00-43e4-a80f-2c6bce9fb64b.filesusr.com/ugd/f103bb_4f41c996c1d94c84b545aa97a6f56b2f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/14b9c204-8d38-4a1e-931b-2af4a1129090/boy_in_the_striped_pajamas_summary_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c42fdd9-cff6-4203-8f62-f56e36c660cc/pobaxotutigidamumarofafir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/247b32e1-1993-4339-8d4d-dfaa6538707a/obdlink_lx_obd2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/659ddff5-670c-4e6e-8b36-177bac52c73d/how_well_does_cbt_work_for_anxiety.pdfIn PDF document text
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_eca549928d2b4ff79a2a11bc1d1af1cf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e2cc692-c8a8-49df-8a98-4ba11253e27d/japosuliga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10a089f9-1fa9-4800-9e86-f75a832b9790/watch_marvel_movies_in_order_on_disney_plus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a368b292-a5ec-4c8c-bb6b-1b2def8178f3/kidde_kn-cosm-iba_recall.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30100d77-a2a8-481e-8400-23f62502b7a6/how_to_thread_needle_brother_sewing_machine.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B3 5036 bytes
SHA-256: 4beb5a81831820fe5fc433f0c1387d7317e3be814aa5f6c5a13a69bc03019ec8
font_01_sfnt_off000106a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A6 10260 bytes
SHA-256: ecfa70bc19f7b1d8715de42317d54e2d7d24807e22d74208be1d4c25bc59ad1e
font_02_sfnt_off000129ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129AD 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2