Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a0fb52f42d8349…

MALICIOUS

PDF

82.8 KB Created: 2021-05-01 17:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 0dbfa63d45fcf3aacbf3d66a4d5a79ed SHA-1: ce4ca9bbb7ac3426221d4ebeafd4b7d0cfc1f0e5 SHA-256: 09a0fb52f42d8349c00d0468ce4294e3e77bfb2d99bd6520528c4d2c799fcf16
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains and are likely part of a link farm. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a non-standard use of PDF for SEO manipulation or potentially phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The embedded URLs are the primary indicators 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://golowaki.ru/strik?utm_term=covid+numbers+in+york+maine PDF link annotation
    • https://cdn.sqhk.co/mitukutowum/iemkI0M/xeselesanipesix.pdfIn PDF document text
    • https://cdn.sqhk.co/jabisopomuxo/jelhdRO/vipewuzasesabafoxosipuf.pdfIn PDF document text
    • https://cdn.sqhk.co/sotatixorawi/8wjg7T1/27334403606.pdfIn PDF document text
    • http://fojibewuf.iblogger.org/kindergarten_phonics_worksheets_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501501/normal_606dd2d3a8912.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444644/normal_600dc81962b8a.pdfIn PDF document text
    • https://cdn.sqhk.co/ritasuxa/aiaj6jf/accounting_cover_letter_templates_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382958/normal_605a4674a13d8.pdfIn PDF document text
    • https://cdn.sqhk.co/zidexamuwela/shdjjje/cuba_travel_restrictions_history.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403676/normal_5fe57db2bdd9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367674/normal_602042c2d5473.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/2fdd602c-2228-4484-81a9-7bb646ef852d/reddit_sat_math_2_practice_tests.pdfIn PDF document text
    • https://09972071-4174-499b-90b1-de3619f59f53.filesusr.com/ugd/d1c05f_27bdea8462e145269d91f01e7308413f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b95e696c-ffe5-4899-9887-2099dd828c7c/what_is_the_setting_of_the_highwayman_poem.pdfIn PDF document text
    • https://da4cb982-96ac-4827-b01c-1601b1c9977c.filesusr.com/ugd/b05c40_72e63c76eca14782b93e0c7d300f4904.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/95fc5360-0310-498d-9bf5-4c59c280d571/who_died_from_little_house_on_the_prairie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d46432b4-492b-43db-b3e3-9d3fb6f9d81b/how_did_zeus_interact_with_humans.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d91d1d1-5b92-49d4-8c5d-77a29ec7c171/butefuxadorajuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b36ec562-3d6f-4e8b-8a07-e4bd94907c43/how_to_unlock_a_lg_k20_cell_phone.pdfIn PDF document text
    • http://bukuzagalu.rf.gd/ducksters_renaissance_crossword_puzzle_answers.pdfIn PDF document text
    • https://e1ca4115-fb55-43f9-84f1-eaf814f8c83f.filesusr.com/ugd/18122d_8c647077c7ab4d35ba5643d7eb16e921.pdf?index=trueIn PDF document text
    • http://rajafidaforuzav.epizy.com/world_war_z_full_movie_in_hindi_free_download_utorrent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d88f50e-de0c-4ff6-8aa0-629045c13a53/how_to_bleed_hydraulic_pump_on_ford_3000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd6fcb3c-a6a3-41ea-83f0-7435469d5421/33836720502.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ecd4cf7-13ae-45a4-a639-7b25f73951ff/90802106209.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25534961-17c7-4dfb-ba59-a6061e1b1bdb/how_to_clean_milk_frother_on_espresso_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001053d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053D 5212 bytes
SHA-256: 181018996b0e879a63dcceb847a4edf4e021a87ce1601e41e6a1a504c4c5cdab
font_01_sfnt_off000116e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E2 10784 bytes
SHA-256: a6e97bf7397208d26ad5be2d21fdb83b5398c4b71655f0860c3dd95f29069ac3