Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc185ae72f16d565…

MALICIOUS

PDF

86.1 KB Created: 2021-06-14 19:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 13555b0dfc2d205db1b91a55cfba41a1 SHA-1: 8001aa3efc65e82c1db8a3f84d7aa863c1015d7c SHA-256: dc185ae72f16d5651958c0ff272267534f390617da80d18e04766c44be011eb8
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 0.9988

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://laborke.ru/pbw?utm_term=tokyo+ghoul+season+2+ep+13 PDF link annotation
    • https://pazumufavizup.weebly.com/uploads/1/3/4/5/134506393/mopadudavozitoj.pdfIn PDF document text
    • https://wubiwadodeta.weebly.com/uploads/1/3/4/5/134577579/e57b5ae09811.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://uploads.strikinglycdn.com/files/a3521260-9702-4998-9043-6bccddedb29d/jorekesepirifusewegoruvet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6c210b4-f1f1-4d11-ab3f-55a01394b954/what_is_energy_storage_system.pdfIn PDF document text
    • http://fujiserefi.pbworks.com/w/file/fetch/144805716/64694959851.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4a7abaa-cd70-4023-b66b-c19f93803a52/ingersoll_rand_air_compressor_2475_pressure_switch.pdfIn PDF document text
    • http://tujedet.pbworks.com/f/nitro_type_hack_money.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/198ce90f-6fe8-42e9-9473-78af085a126d/rujesexemuboxuzufave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74120cdb-13f4-40d7-99c5-80093bfee6f8/tagenodosezuxekonizava.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/427be2b0-397f-4e84-a6c0-ac0858d3a49c/100_books_everyone_should_read_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d915c29-3c30-42f6-bb28-59bdd233be4a/pufukajapuw.pdfIn PDF document text
    • http://komogabovuwa.pbworks.com/f/how_to_put_salt_in_my_water_softener.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/022035dd-e9df-4f54-9c3e-b61fa9c13988/1166037742.pdfIn PDF document text
    • http://jumogitakos.pbworks.com/w/file/fetch/144829164/gta_5_sell_cars_offline_mod.pdfIn PDF document text
    • http://rezedul.pbworks.com/w/file/fetch/145027470/22301544108.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba680f74-c787-476e-8f07-70bde7e45a06/answer_key_of_maths_ncert_class_9.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07d34767-ba12-4ddd-b7d2-1401dc08c7cb/44412291145.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91bf147c-7921-4c6b-b182-61be9cff4887/97784659217.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/404bba05-ace3-441f-8021-d6177f2e6e4d/81125323540.pdfIn PDF document text
    • http://famukaser.pbworks.com/f/76795334371.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/634a8c9c-ed03-4cb7-b3e0-edac8b6a665b/malayalam_poems_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/720eb941-1886-4474-81de-aefcc4ea96f8/kenmore_dehumidifier_35_pint_how_to_use.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F6 3032 bytes
SHA-256: df9f4cd6e9de40365b91a964bcae4a3fb22b51317d0013c1aee0b1d68336169a
font_01_sfnt_off0000efb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB6 5204 bytes
SHA-256: 435bed4cf57c4b5c4d440a31e76e37e03de2db65e3d97156f6b4b8b5bdfb3ce4
font_02_sfnt_off00010172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10172 11132 bytes
SHA-256: cbf6a129952b08f541a4864cd00a74a63b08beeee7a5798c66931974fc4877b3
font_03_sfnt_off00012721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12721 16140 bytes
SHA-256: 4d85727478ac3464284c0dec71be7b534e191fafcb65ae8270c292ab99fb3214
font_04_sfnt_off00013c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C23 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333