Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40b6ee4ee9e9d68…

MALICIOUS

PDF

76.2 KB Created: 2021-04-07 09:41:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 58bf6fde96543c0b8a67ef47b771d5f9 SHA-1: 08bfe388e7d441302069323dcbf9bd4a6c31b9eb SHA-256: b40b6ee4ee9e9d68f23cec031f5f84b91836f64d5185b08aaf2cf4a7f66dbf68
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or phishing for credentials. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/123?utm_term=cardio+workout+routine+pdf PDF link annotation
    • https://cdn.sqhk.co/dagozuwemep/ciigjPa/zukam.pdfIn PDF document text
    • http://dosubodanes.mypressonline.com/air_force_1_custom_butterfly.pdfIn PDF document text
    • http://wejowadizabudex.mypressonline.com/facial_nerve_blocks.pdfIn PDF document text
    • http://mafuzeroxem.22web.org/sakozabokavolefabefonija.pdfIn PDF document text
    • http://rexuwoxaga.sportsontheweb.net/19454687203.pdfIn PDF document text
    • https://nusuxoxoli.weebly.com/uploads/1/3/2/7/132710665/7330533.pdfIn PDF document text
    • http://tularafujebok.iblogger.org/sipobuwokotukoredetaf.pdfIn PDF document text
    • http://kijejakedaje.22web.org/annecy_map.pdfIn PDF document text
    • http://xajoraxi.22web.org/pesetowiras.pdfIn PDF document text
    • http://siwupezomejen.getenjoyment.net/sap_inbound_shipment_table.pdfIn PDF document text
    • https://cdn.sqhk.co/jimevexir/hQhjigl/64657031608.pdfIn PDF document text
    • https://gazulaloruvuv.weebly.com/uploads/1/3/4/6/134693071/nokiku-jusitase-dupad.pdfIn PDF document text
    • https://xijuwubime.weebly.com/uploads/1/3/4/2/134234920/xumarusaru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_c680634cd2d543a6b202a415575d9e8b.pdf?index=trueIn PDF document text
    • http://nizowozutagele.atwebpages.com/ejercicios_de_numeros_romanos_resueltos.pdfIn PDF document text
    • http://ritivujivanupu.epizy.com/tewitisisaxesixubebodow.pdfIn PDF document text
    • https://6762652a-e869-40f3-960d-1446d4066230.filesusr.com/ugd/55e6b1_b9ec40af5ff54f21996b3aac26987d93.pdf?index=trueIn PDF document text
    • http://vufagozujidivu.epizy.com/33028972763.pdfIn PDF document text
    • https://587b455d-cc79-4428-8e80-a8b75ce23bca.filesusr.com/ugd/021ec8_eab1887254f34663a843f019f608ad50.pdf?index=trueIn PDF document text
    • https://7fd672c9-0ac8-42d3-9d3c-9ebb2fbea2b4.filesusr.com/ugd/92785a_445b25c6019c4422bbbf84e707cd4156.pdf?index=trueIn PDF document text
    • https://6680615c-3592-42a6-94f3-b98e474b5330.filesusr.com/ugd/252546_71787e35ef464f5f91b9ad33b31ed1e3.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_off0000ef05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF05 4888 bytes
SHA-256: eb50203a221e882540aac4a17ffc6b9fb8e89784d05eb4bba7ba07a2245fafae
font_01_sfnt_off0000ffc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC9 10532 bytes
SHA-256: a675206e04bc4432c9a61301bc2365a846b00c8e3cf4c8b533f9141da3e500bc