Malicious PDF — malware analysis report

Static analysis result for SHA-256 11a93519af24cfce…

MALICIOUS

PDF

81.8 KB Created: 2021-05-15 02:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b644ef35dd466731ca10a63a302a0ad SHA-1: dcb0ce40e1be97acb4bd98a9df4528bfe22ae690 SHA-256: 11a93519af24cfce0e7a116090bfb444ec7ce7c4d0ec96b7559cf6accce43505
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing or malware distribution lure, as indicated by the ML classifier and ClamAV detection. It contains a link farm with numerous external URLs, many hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The primary URL appears to be a disguised search result for 'Dwarf fortress steam version download', likely a pretext to encourage clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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 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://seumenha.ru/strik?utm_term=dwarf+fortress+steam+version+download
    • http://foxiduwanati.mygamesonline.org/43993799231.pdf
    • https://cdn-cms.f-static.net/uploads/4388818/normal_603d1a8e6862c.pdf
    • http://fusojosejivo.iblogger.org/how_to_calculate_mass_with_density_and_length.pdf
    • https://cdn-cms.f-static.net/uploads/4450719/normal_60474c6d1ebde.pdf
    • http://fovikoxesaweziz.medianewsonline.com/california_residential_lease_agreement_2021.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bagegamejejupu.epizy.com/vuxupafoxijisureturoru.pdf
    • https://dda5c79a-a75d-44d9-a006-48dec3bfe172.filesusr.com/ugd/115d6e_4b8142f23db34309b22d0c95f8c5cb21.pdf?index=true
    • https://907864b8-ab38-4b43-b195-7646ee37c451.filesusr.com/ugd/c4b402_c3b88be9c1b44adca904d093cf40448f.pdf?index=true
    • http://wiwazez.epizy.com/bca_1st_year_books_2020.pdf
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_f1a73dac9fa24bffbd06b85efa0dbe22.pdf?index=true
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_d4f40b9e644740d7bd7abd11b3198aee.pdf?index=true
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_82a823d854234f0fa18d12619fe9184a.pdf?index=true
    • https://c75ed97e-f406-4d79-b864-c99612e64be8.filesusr.com/ugd/a66d15_12c464e87e704bc68637db7bd0968f46.pdf?index=true
    • https://84d51d8d-5932-465a-b044-5d36dace581c.filesusr.com/ugd/98e2de_1ee48f8454eb4500bde04e8f7a36b020.pdf?index=true
    • https://edcb5511-827b-40b0-97c1-3499c313f96b.filesusr.com/ugd/0779a3_4155a49388d842f9b609b11a04e9ca93.pdf?index=true
    • https://276658a2-c6b1-4a23-bc3b-56c82bce4278.filesusr.com/ugd/f9448a_9075ddb0115f4201992a72d454559824.pdf?index=true
    • http://gofosuxubajo.epizy.com/tekasebonorasawavatakij.pdf
    • http://filosoko.onlinewebshop.net/53988540426.pdf
    • https://2e8e3215-33bf-4fe1-bc67-b38dac560527.filesusr.com/ugd/269bb8_703248e031af4695b0b354f5ec1da1cf.pdf?index=true
    • http://balukop.rf.gd/fafonasasogumatatidafevaf.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f46b.bin
707f044220626673030db1e929683b7e6be6df4515348478205ae719871ec17a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF46B 3312 bytes
font_01_sfnt_off0001004d.bin
087411b6cd835806e1b47270ba97c9a247de31baf045e98d0ae7e07c18aa9609		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1004D 5204 bytes
font_02_sfnt_off00011209.bin
c489ffac2b023d0b4a45379184eb20f51d9257a54ebc58b4e9a2551f7052fe4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11209 11560 bytes

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