Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e756c928eb51b96…

MALICIOUS

PDF

76.6 KB Created: 2021-05-11 06:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c20b25cfdd8d3dfc8fd39adf4810b3be SHA-1: e22cce24019373626f8f89681414a3c4d2da7898 SHA-256: 2e756c928eb51b96363cf9e92f6cfad9ff6cb21f3296208c6559e2215e059af1
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 0.9990

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://midufefew.ru/strik?utm_term=suzuki+samurai+engine+rebuild+kit PDF link annotation
    • https://votozugilom.weebly.com/uploads/1/3/1/0/131071295/faxusegejibememumu.pdfIn PDF document text
    • https://viwomesaw.weebly.com/uploads/1/3/4/4/134472777/juvebalub.pdfIn PDF document text
    • https://fitisasituwag.weebly.com/uploads/1/3/4/8/134846324/munif_betozuv_folopud_namiw.pdfIn PDF document text
    • https://mepanomelisegil.weebly.com/uploads/1/3/4/8/134899905/ba98eb.pdfIn PDF document text
    • https://ragesetenavuxom.weebly.com/uploads/1/3/1/6/131606186/52b05c764b3f4c.pdfIn PDF document text
    • https://supagerafigi.weebly.com/uploads/1/3/0/8/130874211/5f57d43.pdfIn PDF document text
    • https://wugumura.weebly.com/uploads/1/3/4/6/134601103/0700dee41dac95.pdfIn PDF document text
    • http://rimka.xyz/meade_lx200_10_inch_for_sale82xgk.pdfIn PDF document text
    • https://bafosuronam.weebly.com/uploads/1/3/0/7/130738527/9008058.pdfIn PDF document text
    • http://sun-italy.space/how_to_fix_error_code_rdk-03033c3e3y.pdfIn PDF document text
    • https://bapefakujina.weebly.com/uploads/1/3/4/4/134483882/mogikorodewaki.pdfIn PDF document text
    • https://lefexaro.weebly.com/uploads/1/3/5/3/135324439/dixewew_kawak_sulapilitav.pdfIn PDF document text
    • http://doordash.link/86551306603dij0c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_4e4963a5f8f54f92af180e2b3403147e.pdf?index=trueIn PDF document text
    • https://7f993087-45f6-41f4-96e5-9dcaca18fb91.filesusr.com/ugd/9a92dd_e66574f84bd8454f82dbcc67de7417e8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b7ff881-8838-4008-ac7b-80b28b062396/nagutovotatimexuvimubebo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f94cc666-2e87-4a49-807f-ee1603d0d768/karcher_power_washer_1800_psi_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0aaeec7-0208-41b1-9665-1ec509b9c83a/29098650527.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/walepolebulijatik.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/free_cookbook_templates_for_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9477430-71c4-4f7e-be23-6db75ca720d5/mexetutoguvimu.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/kovogujumaviteselafega.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/how_to_reset_a_datalogic_scanner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/086e9347-5e30-4dee-87ac-932d4e0ebfcf/berserk_manga_chapter_100.pdfIn PDF document text
    • https://aa6eca1a-c690-4a36-985e-a873157a80b3.filesusr.com/ugd/081493_80daa54ff299407fbaa6134d9fb339d3.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_off0000eb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB47 5504 bytes
SHA-256: c4f440a30d86d30bea115ab5cd357cf6e0a46fa165619faff480dc04e4b94f9f
font_01_sfnt_off0000fdee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEE 10844 bytes
SHA-256: 2bfc1d397d518fce6226e31d2895bdf1ededc461534e8259266a02a664a90652