Malicious PDF — malware analysis report

Static analysis result for SHA-256 918d95c401440f2f…

MALICIOUS

PDF

94.7 KB Created: 2021-05-28 12:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8159abf1dec9ae74a6c588bb97fcef9d SHA-1: 22d665833090f5d0649c8dacb4ba45cbac83d013 SHA-256: 918d95c401440f2f564271ad9b1c14e4772c471294ff755ce76a3995f514d7ba
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 0.9991

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://jumiwimov.ru/123?utm_term=invisible+inc+console+edition+trophy+guide PDF link annotation
    • https://faxasuxudoxo.weebly.com/uploads/1/3/2/6/132695360/6814038.pdfIn PDF document text
    • https://miruvogix.weebly.com/uploads/1/3/1/4/131408245/1158762.pdfIn PDF document text
    • https://xilemuje.weebly.com/uploads/1/3/4/2/134265988/53f26a27df.pdfIn PDF document text
    • https://giligigava.weebly.com/uploads/1/3/4/4/134494785/8040748.pdfIn PDF document text
    • https://jomagikovire.weebly.com/uploads/1/3/1/4/131408086/muvuko.pdfIn PDF document text
    • https://rawitexebava.weebly.com/uploads/1/3/4/4/134487877/1828262.pdfIn PDF document text
    • https://fewebiporunivag.weebly.com/uploads/1/3/0/7/130775920/f35759d71e3.pdfIn PDF document text
    • https://gifivetusox.weebly.com/uploads/1/3/4/7/134736849/latovata.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/8cf1dbd3-23aa-4448-9598-063d563ca2f6/jowozamujogatugejulotop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0be24fe4-1f0e-4be5-a85f-1d92cf18b419/the_explosive_child_ross_greene_website.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/449bb4b5-0c3a-49ee-b56f-7aa79e9ddcd5/how_to_write_a_resignation_letter_nhs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/373f853f-2391-4a38-9f2c-e2e4c7bb0138/summary_news_lead_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8053783f-c9e6-466e-af3c-8c9e3893e438/are_bryant_furnaces_any_good.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b87296e-db4b-423f-8f7c-bc3a81894301/kudepexewunat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a47fd9d-0e04-460c-aba5-c95c01c112bc/bhagavad_gita_chapter_11_sanskrit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eddf6f53-1944-4211-8395-d21a37fec443/lugatopukegokubumivujof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77a87ecf-c8af-4177-9551-d9fd51001c6e/75546961871.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2234fbb4-0f93-4eb1-b0a6-d9734cd61bcf/81528435478.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56c55298-62eb-4bc4-be0a-96a1926664b1/ideal_gas_law_gizmo_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ad065dd-6ddc-4bab-95e5-f489b33ed933/signs_something_is_wrong_at_17_weeks_pregnant.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccff1501-6104-4dfd-aaf3-024b5c4d99f1/ruxavupiweme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e06d4cb-1618-4b3c-8e84-6fe5db10de2f/buvepewusirufosuriko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d76a2b4a-5f0b-4431-9db8-d502dfe0ed5a/battletech_tabletop_miniatures.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63df76a9-9337-4fb7-b917-a1413f048f89/set_time_on_dsc_1616.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_off000135aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135AA 5364 bytes
SHA-256: a01f55fb62f265a5e00a17d66d4e312f422a7f6153e63e137c3e518fe3f58e62
font_01_sfnt_off000147ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147EE 10856 bytes
SHA-256: ed3a8c79d3e185e85702184c31f597ad5321212c4d7a32649f381cc2528ca10c