Malicious PDF — malware analysis report

Static analysis result for SHA-256 18de003f275a0c40…

MALICIOUS

PDF

81.9 KB Created: 2021-03-11 08:11:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 016cee08400f3717bf8089295f0db1ef SHA-1: 72f6e1efbcd539a50cd12952fa90c0351540289a SHA-256: 18de003f275a0c403d838f6b1df1d69a2979d293e51e8ee9a1cd37f0efc70494
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it's part of a link farm or SEO spam campaign. The primary external URL points to a resource that appears to be related to printable envelope templates, likely a lure to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://soxebez.ru/123?utm_term=printable+envelope+templates+microsoft+word PDF link annotation
    • https://jefanumu.weebly.com/uploads/1/3/4/8/134889008/a8bef9d41d.pdfIn PDF document text
    • https://lurusavi.weebly.com/uploads/1/3/2/7/132710630/rimedelapubirude.pdfIn PDF document text
    • https://cdn.sqhk.co/mugegiduveb/eRohfic/xolugobobopadisire.pdfIn PDF document text
    • https://figusemaf.weebly.com/uploads/1/3/2/6/132682639/756dbf13cd76a04.pdfIn PDF document text
    • https://gojenejanoz.weebly.com/uploads/1/3/0/7/130739654/9ec90e1e.pdfIn PDF document text
    • https://pewarefat.weebly.com/uploads/1/3/4/3/134361746/b237ac8.pdfIn PDF document text
    • https://sejumajofejopib.weebly.com/uploads/1/3/2/7/132740214/3941920.pdfIn PDF document text
    • https://muwewixobajigu.weebly.com/uploads/1/3/4/3/134312624/lelarolet.pdfIn PDF document text
    • https://gidafefutor.weebly.com/uploads/1/3/4/0/134040883/fusiz.pdfIn PDF document text
    • https://xenosolenofudel.weebly.com/uploads/1/3/5/9/135990942/4043805.pdfIn PDF document text
    • https://ramageputa.weebly.com/uploads/1/3/1/6/131637054/e35d90.pdfIn PDF document text
    • https://nodifolosorak.weebly.com/uploads/1/3/4/7/134758422/mabelijoloxigirenelo.pdfIn PDF document text
    • https://cdn.sqhk.co/lodikorep/xJ70jcP/capitol_theatre_yakima_washington_events.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_462715627b4b4b56b3131c26044db04a.pdf?index=trueIn PDF document text
    • https://22fea36a-5e19-4af1-b4aa-fe6e1efe0ee9.filesusr.com/ugd/b5a188_ff04af8436a644e998f93b1b2ad8a21b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/09f3e76b-dd48-4dc6-8d32-9abe1a64da7d/are_spray_gun_tips_interchangeable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c98f0c2-16de-41a6-807a-df498cd64bf6/what_is_the_history_of_math.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43aedf48-ad41-4e1a-afa0-2bd9b895a74f/what_to_write_to_godparents.pdfIn PDF document text
    • https://47c0d0ed-94e3-447f-940a-e265262d053f.filesusr.com/ugd/a43ec6_88a893273a164db9b0ebf88f14a6357b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/65d0b013-acd3-46a2-8e1f-3fc0ae6a2b3d/how_to_make_a_sweatshirt_without_a_pattern.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fad0a08-cfb2-4975-b64f-6c2f3cf09f75/22980472961.pdfIn PDF document text
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_0dd2c65388674964949a1748fe508b64.pdf?index=trueIn 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_off00010353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10353 5596 bytes
SHA-256: 284af87a18823d7644454da79070da862bcdef408d47895a06350bf4a5e68f71
font_01_sfnt_off00011652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11652 10392 bytes
SHA-256: e5330a42816b573d4a70e66ac7067897128f441a58203765779e9e34ece4e64a