Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f5ed3a34b7bef35…

MALICIOUS

PDF

79.7 KB Created: 2021-03-29 00:34:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 0a599deffa4460f9259c8b4ddc69632f SHA-1: c50d2fa53cde8a11e253c8aa9ced30cb572129db SHA-256: 9f5ed3a34b7bef35ab6e624fe51738c118e926d1aba74461233bab7fc1d68b59
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URL and the document's apparent purpose of redirecting users to external sites support the classification as a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/award?keyword=anemia+falciforme+epidemiologia+pdf PDF link annotation
    • http://gisujug.mypressonline.com/wazefax.pdfIn PDF document text
    • http://zofunubesosena.mypressonline.com/palolelawofugufikob.pdfIn PDF document text
    • http://prizinsta365.website/apsrtc_pf_loan_application_formrfhq0.pdfIn PDF document text
    • http://workshop-fb.ru/ru_pg_admission_form_2019p00oy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mixanaz/audi_a6_repair_manual_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/91618089015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/babbf2b5-6245-413b-ae82-73a1288d0527/most_difficult_maths_brain_teasers.pdfIn PDF document text
    • https://6b2f37ea-3696-4b87-858b-663c379f6f6f.filesusr.com/ugd/16879a_04025dc1bd224daf9525af5e07cf2415.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5d00201-cd80-40b1-915a-2fede65e636d/thermador_fridge_water_filter_reset.pdfIn PDF document text
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_5de20de2a913476981dcd45d504fd6ea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/11d78029-97ec-436c-a260-b0d6e3196835/57023145545.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bd498ab-d03d-40a5-a306-056f51673643/how_to_ignore_fake_friends.pdfIn PDF document text
    • https://e5aadbcf-511f-4ee2-989a-4410a22eeed0.filesusr.com/ugd/64930c_bfb01deaeb154ef882d5983e3639c488.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lumixi/dunkirk_boiler_ratings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1c5612e-e3ea-4b7c-9a69-f995fcacb484/how_to_connect_my_onn_soundbar_to_my_roku_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61a58690-a8e6-4a96-bb6e-3556b72b327d/game_of_thrones_recap_season_3_episode_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eadc8db8-a461-42b4-9295-a894940e2cdc/naramixijud.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF87 5284 bytes
SHA-256: 5f4ec8c3f478c7f16ce81fb02416826356c3f3bb940930b2661ab51e9a255465
font_01_sfnt_off0000f16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16F 13572 bytes
SHA-256: 754decf20a7aa8f208c7970d99a7cdf2aaa39c1389dc769116e65006428b92c8
font_02_sfnt_off00011aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA8 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd