Malicious PDF — malware analysis report

Static analysis result for SHA-256 99a11557c633a171…

MALICIOUS

PDF

74.9 KB Created: 2021-04-05 12:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b43d5d2818ad57332693c2e823f32a9a SHA-1: 776340df305d4c8ced98b4a13d73973feafa2e2e SHA-256: 99a11557c633a1710f8e055a512f693dde0a0a86fa3483c0df90b821e77c6da0
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, indicating a likely attempt to redirect users to malicious sites. The presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/strik?utm_term=professional+growth+goals+examples+for+teachers PDF link annotation
    • http://nanonewe.scienceontheweb.net/abordagem_neoclassica_da_administrao.pdfIn PDF document text
    • http://kisuvok.scienceontheweb.net/66634727595.pdfIn PDF document text
    • http://sogejovep.mypressonline.com/twilight_2_full_movie_in_hindi_download_720p_filmywap.pdfIn PDF document text
    • http://melivoxigozige.mypressonline.com/jumijodezeletixop.pdfIn PDF document text
    • http://ginisuna.iblogger.org/23017923720.pdfIn PDF document text
    • http://xidufefonudug.sportsontheweb.net/future_value_interest_factor_annuity_table.pdfIn PDF document text
    • http://rivilidopu.medianewsonline.com/candlestick_patterns_poster.pdfIn PDF document text
    • http://pararapameso.getenjoyment.net/cardioplegia_del_nido.pdfIn PDF document text
    • http://gebigulexejo.sportsontheweb.net/forovenolunu.pdfIn PDF document text
    • https://morisoxurekes.weebly.com/uploads/1/3/4/4/134464458/fuganibadurarejuv.pdfIn PDF document text
    • http://fikakutipid.mygamesonline.org/data_structures_and_algorithms_in_java_tutorial_point.pdfIn PDF document text
    • http://xeberul.mywebcommunity.org/gianni_schicchi_o_mio_babbino_caro.pdfIn PDF document text
    • https://vizazoxo.weebly.com/uploads/1/3/4/6/134600102/jikidula.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xiletubijalu.rf.gd/how_to_assemble_dirt_devil_endura_max.pdfIn PDF document text
    • http://disoluje.myartsonline.com/nec_article_250.pdfIn PDF document text
    • http://wegugoleta.onlinewebshop.net/25742032953.pdfIn PDF document text
    • http://gemovimuwopete.atwebpages.com/32845093126.pdfIn PDF document text
    • http://januxak.rf.gd/vshare_for_ios_7.pdfIn PDF document text
    • http://pevogikuxupeja.onlinewebshop.net/lulixenerotikonapozi.pdfIn PDF document text
    • http://vidoniwofunevan.onlinewebshop.net/73610879855.pdfIn PDF document text
    • http://sakogabutal.onlinewebshop.net/dipawata.pdfIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D8 5592 bytes
SHA-256: acc94e5ae7ff0d98225068d5d1d260e43483cd883d385869f9a57a04984d98e3
font_01_sfnt_off0000facc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACC 10384 bytes
SHA-256: ee56c2bf132c93afc0b1326bb945b8e3f25afa6afcdc7f4718d52543117f9727

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