Malicious PDF — malware analysis report

Static analysis result for SHA-256 c482d524983632fd…

MALICIOUS

PDF

69.8 KB Created: 2021-06-04 00:41:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7d22de4335a3696a3b334644e767d58f SHA-1: b09012ece632eb27c3e6efafd0713ff81d8c7cdd SHA-256: c482d524983632fd1e1f9c913a0913df827a18924e3dd8d02f0ac22ab447e277
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 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/pbw?utm_term=thomas+l+floyd+digital+fundamentals+11th+edition+solutions+pdf PDF link annotation
    • https://fiwetoki.weebly.com/uploads/1/3/4/2/134235589/719533.pdfIn PDF document text
    • https://lifalaril.weebly.com/uploads/1/3/4/8/134883644/1390545.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408991/normal_5fdd5d7f71f35.pdfIn PDF document text
    • https://wipedevibenisi.weebly.com/uploads/1/3/5/3/135315865/7459590.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416514/normal_6066b918c8ecc.pdfIn PDF document text
    • https://poriveba.weebly.com/uploads/1/3/4/3/134316211/xutumedepuwug_wavenumog_vufezawunoj_wazuwofuri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422890/normal_606a3342e8aff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454682/normal_60233c0c3ca7e.pdfIn PDF document text
    • https://fojojaroj.weebly.com/uploads/1/3/1/4/131453509/188cbdc9e251caa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wigiwopajuke.pbworks.com/f/how_to_get_a_free_netflix_gift_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/963ee3b9-19d2-4822-a1d6-4fc880f0d683/54468151099.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/217bf1b2-56ff-4413-8541-c9362ab5bb1c/line_graphs_worksheets_grade_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cba9d7d6-47c4-4db1-a3dc-8c91f2a5b695/jelitufugedupesoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b059382d-cda6-41f0-be4d-232293bc84ad/marketing_5.0_philip_kotler_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10a432d8-fc45-4231-96d0-b1bc856326d2/jigegebuzid.pdfIn PDF document text
    • http://zufogopojut.pbworks.com/f/5954544542.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4482c0fe-143e-4d53-8dd8-42aa620685f4/att_dect_6.0_expandable_cordless_phone_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d0f7013-6469-4d49-ac9d-e04bb7bec0bf/spelling_practice_for_second_graders.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e5ca037-dc06-48c1-a986-32e9eac378e9/kisaxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54bdb664-7fd5-492a-a108-9bf504e046a5/dell_poweredge_2900_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78151680-62a3-4ada-8099-6dfc9be387b0/xesivenup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4fdbff5-19fc-4b50-abe6-27b43c8b641d/fabopitawokixilo.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_off0000d366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD366 5460 bytes
SHA-256: f90909488a2847929dde83ff5bfd57d8fac3891d1a3700e6755a8522b31b4c91
font_01_sfnt_off0000e5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E9 10392 bytes
SHA-256: fc59683946de5d2b39e0d397a0a37dc3e48656386e1a092a2b8476f9a55ac2ba