Malicious PDF — malware analysis report

Static analysis result for SHA-256 77e771cafdb70106…

MALICIOUS

PDF

80.3 KB Created: 2021-04-07 06:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f62bcc4f5b89d3546704c77f1f929345 SHA-1: 128ab039f0f590cd4ea19859c6a517b6342e4fb2 SHA-256: 77e771cafdb70106cb36523ad8c1c9ebc98101d0c807306aaab9bb2458002445
126 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous embedded URLs, with one specifically identified as a potential phishing lure related to a 'Sony alpha 350 user manual'. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and a link farm heuristic suggests the document is designed to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=sony+alpha+350+user+manual
    • http://damita.fun/backup_app_apkpurejwtvz.pdf
    • https://valiwuvubeke.weebly.com/uploads/1/3/4/6/134694219/wuvobim-gimumipezev-sitimu-dubomagij.pdf
    • http://deine-gabe.com/are_android_phones_linux_basedqlkxf.pdf
    • http://xteenware.online/jurassic_park_operation_genesis_pc_download_utorrentfto7s.pdf
    • http://xikewimuvos.iblogger.org/lecturas_domingo_xviii_tiempo_ordinario_ciclo_c.pdf
    • https://wisevagidigo.weebly.com/uploads/1/3/0/7/130740356/41ee043c55.pdf
    • http://zowezuluma.22web.org/beauty_and_the_beast_musical_full_script.pdf
    • http://trokot-tonirovka.online/tulovapiwetibowunetage0rc8e.pdf
    • http://damvglaz2.xyz/66304352834cwglo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wixatax/song_of_solomon_sparknotes_chapter_1.pdf
    • http://rowavironipomiz.epizy.com/mathematical_induction_difficult_problems.pdf
    • https://s3.amazonaws.com/vabedafozo/bleach_vs_naruto_apk_latest_version.pdf
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_5b1e4632eeca4c589ba25f0b13d64c5f.pdf?index=true
    • http://nedelovuz.rf.gd/nagilorelikakisizajesodex.pdf
    • http://sokiguxesixup.epizy.com/39122492198.pdf
    • http://sekupudim.rf.gd/bacteria_types_and_shapes.pdf
    • https://s3.amazonaws.com/mibiwivanetuj/73325231254.pdf
    • https://6a9ecc2b-05c3-4056-8705-773ae6be8cdd.filesusr.com/ugd/7a359d_56dfc754e754463383c0e71bf1b49422.pdf?index=true
    • https://da25564d-e3c2-4b9b-87ba-dd8ce2ae78d4.filesusr.com/ugd/c82cd6_d88c2fd62609421ba139be729b79907d.pdf?index=true
    • http://damatagowigiz.epizy.com/operational_definition_of_health_informatics.pdf
    • https://s3.amazonaws.com/nitajosasa/vanilla_wow_enchanting_leveling_guide.pdf
    • http://milemiteloxodu.rf.gd/merik.pdf
    • https://s3.amazonaws.com/boduxatavepe/lokefumaxawosesolasik.pdf
    • http://tapopopabe.rf.gd/magneto_ignition_system_working.pdf
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_67771c190a664be181495ab9de70da83.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8e1.bin
8c0651730df00de43afb029fd055c27c57bedac90c9585ae4f555b517afbcef3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E1 5692 bytes
font_01_sfnt_off00010c1e.bin
ca6eebe8c9bf7c5902d31b08c8a936e93e0437039e0685576a2a17a1145565c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1E 11072 bytes

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