Malicious PDF — malware analysis report

Static analysis result for SHA-256 336cca42e2e7aade…

MALICIOUS

PDF

115.7 KB Created: 2021-04-29 03:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1a6be0bfb141dda08f86791244309866 SHA-1: 21cc85b675c304024a3848e47a94856fad2cf1f7 SHA-256: 336cca42e2e7aade2b40c8ccbfd8fc253ddca66a34a42dd48e85032d18de503a
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 0.9997

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://vilenefex.ru/strik?utm_term=radicalism+meaning+in+history PDF link annotation
    • http://melowew.scienceontheweb.net/mcdougal_littell_algebra_2_practice_workbook_answers.pdfIn PDF document text
    • http://bitalotava.scienceontheweb.net/bryant_80_gas_furnace_cost.pdfIn PDF document text
    • http://baliferifopiz.mypressonline.com/nikidenagikiboverex.pdfIn PDF document text
    • http://viniveba.mywebcommunity.org/what_to_do_when_your_disc_wont_eject_ps4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zibevili.onlinewebshop.net/tukupa.pdfIn PDF document text
    • https://d89d6b52-6e76-4e18-bccb-bd7428cfddad.filesusr.com/ugd/02beb7_665ab463b8fb4f6486029d9abf497c2b.pdf?index=trueIn PDF document text
    • https://5a060084-92f5-4e09-b02e-bbac8bb45871.filesusr.com/ugd/05c943_e23867eb41d44af8b7cdcf77f24b4b2a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/why_did_my_nordictrack_treadmill_stop_working.pdfIn PDF document text
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_ce860c4870e04ec9b8a12d5575b20747.pdf?index=trueIn PDF document text
    • https://0ef2f354-78a3-4528-990c-72f69c86fc6a.filesusr.com/ugd/6a0da6_849e90066bf4464da3f9ccb8a21ff335.pdf?index=trueIn PDF document text
    • https://6680615c-3592-42a6-94f3-b98e474b5330.filesusr.com/ugd/252546_5773eef18ed843e7a412b264e118fc39.pdf?index=trueIn PDF document text
    • https://b27aca93-056c-4dd2-83a6-fd909c9f709d.filesusr.com/ugd/2ba3ac_961e585e11a7440088982dd67e0f801c.pdf?index=trueIn PDF document text
    • https://4b4ea461-5266-411b-8735-d5290551f550.filesusr.com/ugd/7fedcf_112126ae9a6545efa52eaaf1c71e1101.pdf?index=trueIn PDF document text
    • http://rogofideb.onlinewebshop.net/what_is_hair_theory.pdfIn PDF document text
    • https://d0570615-6cc6-4b78-9a9c-590639bc525b.filesusr.com/ugd/30850e_5a4ab420235c4c749c73ab0e6e6acb78.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a31eb8e1-0e7b-4284-b9ae-852e28f6b557/how_to_write_science_fiction_and_fantasy.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/angularjs_routing_template_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a7846a7-995c-44ea-8710-faefa250c254/how_to_activate_microsoft_project_2019_for_free.pdfIn PDF document text
    • https://8137cd1e-393d-4948-8193-eca935452849.filesusr.com/ugd/756799_8321a7d557c74f8f96ac6910f4c308bc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/88350010-d26f-4a07-8383-9c67498b3dcb/35953186986.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/import_png_into_android_studio.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_off000182d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182D4 5464 bytes
SHA-256: 0f703981d6113540b7099d10a87fa20c48ec939b0794acff9cc43bdb5f69000a
font_01_sfnt_off00019547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19547 14232 bytes
SHA-256: 8ae2722aa8d3bf4d2abda0985628e47a5ee62aeacc4fcc7f9258079a38766abf