Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd313276385e2bd…

MALICIOUS

PDF

85.8 KB Created: 2021-03-20 05:13:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 57ff4c0faba1ff2f84d47adf2ca9e2ed SHA-1: 18f9330203285c3ed1621523875213108100badd SHA-256: 5fd313276385e2bd49cb20005f522723e419abc21aacce819f704fee4ecd990c
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 0.9970

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://dafemum.ru/123?utm_term=bleacher+report+nfl+predictions+2019 PDF link annotation
    • http://uniques.space/strongs_exhaustive_concordance1khd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488317/normal_6054d91237c8c.pdfIn PDF document text
    • https://lerasakob.weebly.com/uploads/1/3/2/6/132682990/taroru.pdfIn PDF document text
    • https://gopaxabog.weebly.com/uploads/1/3/5/3/135309926/kijefonofos-rebejobuvit-junifelesexoduj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378830/normal_5ff2849ac4cb9.pdfIn PDF document text
    • https://baxufolodamiz.weebly.com/uploads/1/3/1/4/131408032/sikas-ralideforuba-vezupiwupeju-dirowuxije.pdfIn PDF document text
    • http://expressvpn.store/rufekiwukujegutz1ssr.pdfIn PDF document text
    • http://regvoolkim.website/best_tvs_2020_australia3ez1n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413473/normal_603f503a60d97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479470/normal_602b5d6b1557e.pdfIn PDF document text
    • http://ryduslim.website/chatal_band_audio_songs_ingpyhvk.pdfIn PDF document text
    • https://lusukukupesakub.weebly.com/uploads/1/3/0/8/130815137/112dd7143ec28c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388608/normal_6044ce99bea3a.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/1b4de02e-2e75-471f-9bad-d469b46c7661/bezuxuwud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25cbb7b9-71d5-4f3c-a3e5-f7a1e87e25c8/xagowafojojovutififevas.pdfIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_858c591cc0524cdcae1d3bd63b0a8616.pdf?index=trueIn PDF document text
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_c1a888c3332e4280ab3c8cf0affe480d.pdf?index=trueIn PDF document text
    • https://f72e0e13-a873-49c5-9cb5-3c2848b8c5b2.filesusr.com/ugd/f8ba4b_65d47bc7d34848edbd3440f2753447cb.pdf?index=trueIn PDF document text
    • https://b9eb3541-094c-4606-b101-17c2291fd6e1.filesusr.com/ugd/a18601_0cc9b8a311074eaa900ac8f0bdb88911.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/db9f655d-63c2-4c3f-b400-3d0c08f4d611/50251038908.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79cc4b4e-78ee-447c-aacd-3e78e941ebe0/93199412704.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d248f052-47c6-4216-8bcb-ee062627d14c/who_is_the_sexiest_man_alive_vote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dae94e0-cea9-4ca7-9038-5ac5ce7e3659/behringer_xenyx_x2222usb_manual_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b7a5c67-b04f-4f5a-b86c-7f43d93c71de/14705751996.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00d0f400-b895-4692-92be-d961122fedf0/60563249860.pdfIn PDF document text
    • https://ff06b2c9-6223-4357-b4d5-1bf3807c749f.filesusr.com/ugd/717131_08bc11d3478447548b29f64db1f85cd2.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_off00010d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D53 5772 bytes
SHA-256: b20863e242eb533f58e576bc65109e9dbc6a6010c8d735307d7e1ce9ba3b4392
font_01_sfnt_off000120f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F8 11908 bytes
SHA-256: b759c716b182677af7f92a41b0a4d01897e55fad5cb8e0dd644da6522ea0ee32