Malicious PDF — malware analysis report

Static analysis result for SHA-256 727cc80b4cdb0b97…

MALICIOUS

PDF

76.2 KB Created: 2021-03-17 17:14:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 30869d8150105a36042b5d58cebc254b SHA-1: 74f60628d155f9ec021cb5e2583c6bdfbcfca716 SHA-256: 727cc80b4cdb0b97517fd80fcda5f6d752c7f83a9a42bf662dac903187ae400b
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The primary purpose appears to be directing users to external websites, likely for phishing or to download further malicious content.

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://bologen.ru/award?keyword=acceleration+sensor+pdf PDF link annotation
    • https://cdn.sqhk.co/jojipimuve/2ibIjaB/logujikitijoke.pdfIn PDF document text
    • https://cdn.sqhk.co/wixikinotu/hbhbmG0/beginner_woodworking_projects_using_hand_tools.pdfIn PDF document text
    • https://cdn.sqhk.co/mujejadalale/awgfqS5/sprint_spotify_free_6_months.pdfIn PDF document text
    • https://cdn.sqhk.co/nerurepaza/ajh7wig/1486242021.pdfIn PDF document text
    • https://cdn.sqhk.co/jojojidatun/aRVFvC9/81446416230.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/7heMjjj/walodibezararuloxokoxu.pdfIn PDF document text
    • https://wikabolodaj.weebly.com/uploads/1/3/4/6/134648749/tomalidulexaxefu.pdfIn PDF document text
    • https://loleritukala.weebly.com/uploads/1/3/0/9/130969936/fodevikiwusejigevuse.pdfIn PDF document text
    • https://rawiranuxox.weebly.com/uploads/1/3/4/6/134618620/5738420.pdfIn PDF document text
    • https://jaxoruxevag.weebly.com/uploads/1/3/1/6/131606876/6899067.pdfIn PDF document text
    • https://zewajala.weebly.com/uploads/1/3/1/3/131398225/kasuxaf.pdfIn PDF document text
    • https://cdn.sqhk.co/sukonazukuv/dge45QV/29527876511.pdfIn PDF document text
    • https://cdn.sqhk.co/berirenike/jenihYb/dragonvale_breeding_guide.pdfIn PDF document text
    • https://rapovadok.weebly.com/uploads/1/3/4/7/134705404/5405148.pdfIn PDF document text
    • https://naruvemekojesez.weebly.com/uploads/1/3/4/6/134685524/vowaginukuzibet_kiseremizewom.pdfIn PDF document text
    • https://buzapakamewogu.weebly.com/uploads/1/3/4/3/134366326/xomigoxiler_suwipavejape.pdfIn PDF document text
    • https://gomemetunugup.weebly.com/uploads/1/3/2/7/132712315/302ab9ee434ae.pdfIn PDF document text
    • https://cdn.sqhk.co/xezufulozuwo/fihSOwl/shiny_shell_car_wash.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fizup/programar_alarma_viper_3105v.pdfIn PDF document text
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_50b335a1c838454d8ea5633dfcb08b05.pdf?index=trueIn PDF document text
    • https://893c8be9-d140-4a04-8a3e-66bd54b472cd.filesusr.com/ugd/efd7ea_8ee7884021e84136ba5eb6bba3b3a69b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wujapu/busking_meaning_street_performer.pdfIn PDF document text
    • https://52ed6390-a5c1-4502-9f93-599cf6d98ad1.filesusr.com/ugd/f7fbc8_6238645da2be46ee86e3cbfe694bec70.pdf?index=trueIn PDF document text
    • https://27f1a270-5048-4778-87f0-574dfe85248a.filesusr.com/ugd/b7306e_3f28516e80a24f1e8a3fa818ba2ed13d.pdf?index=trueIn PDF document text
    • https://7be8961d-effb-4c78-a255-78c3c9f0be09.filesusr.com/ugd/3dd68e_8d09a400923b4cf99681c51a7e356d29.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_off0000ec73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC73 5140 bytes
SHA-256: 0df92367c03097865a4eb4b44cb332fb5bf6e60a385a63e28a863d60a3bb8e40
font_01_sfnt_off0000fe01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE01 10868 bytes
SHA-256: acdae40773557e4da084733d3b13f0f260206a0d6554cd3ea01518fd56da7eef