Malicious PDF — malware analysis report

Static analysis result for SHA-256 99ff699338befffa…

MALICIOUS

PDF

64.8 KB Created: 2021-02-27 04:51:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 48e0fb9b2209028d758a4508971434b7 SHA-1: 71f436e3900b8e0b7308d30551acc6db3e0fba82 SHA-256: 99ff699338befffab3425c69dd918da9e4845d706278b2f33bd0113b4fc39c73
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content. The presence of 'Caballo de troya' (Trojan horse) in the document body further supports a malicious purpose, likely involving the distribution of malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=caballo+de+troya+9+pdf+completo PDF link annotation
    • http://forovasax.medianewsonline.com/gajewokupe.pdfIn PDF document text
    • http://fizasibako.22web.org/26850840202.pdfIn PDF document text
    • http://zonerokemub.getenjoyment.net/yard_machine_riding_lawn_mower_wont_start.pdfIn PDF document text
    • http://uplrezina.site/world_war_2_reading_comprehension_won733c.pdfIn PDF document text
    • http://revilokepudidu.mygamesonline.org/when_we_dance_lyrics_meaning.pdfIn PDF document text
    • http://vurejowug.mypressonline.com/5178546509.pdfIn PDF document text
    • http://likedizar.medianewsonline.com/2362946743.pdfIn PDF document text
    • http://idealicaitalia-ufficiale.site/fogsi_gdm_guidelinesq0393.pdfIn PDF document text
    • http://jinevul.mygamesonline.org/jasufewagema.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/how_to_install_foxit_reader_printer.pdfIn PDF document text
    • http://lixorajepidil.mygamesonline.org/what_is_in_a_soft_taco_supreme.pdfIn PDF document text
    • http://nigavereke.mygamesonline.org/81458474308.pdfIn PDF document text
    • http://rafupofamurawaf.mygamesonline.org/vugutomezafivon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kodasakame.rf.gd/monikulufemuwes.pdfIn PDF document text
    • http://zubiluwetij.myartsonline.com/vixemifexomikifuxufigi.pdfIn PDF document text
    • http://wifudozakiteg.epizy.com/65236464445.pdfIn PDF document text
    • http://weparaxopulo.atwebpages.com/jesujelodafozeloxabidu.pdfIn PDF document text
    • http://sojufuka.atwebpages.com/23005104584.pdfIn PDF document text
    • http://katurew.epizy.com/adjective_forms_are_positive_comparative_and_superlative.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC010 5428 bytes
SHA-256: 2033126777e20084ae87b51d5da5586bf57ee3877aa3b2eafb4564b929054d0d
font_01_sfnt_off0000d272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD272 10892 bytes
SHA-256: 4ca9bb3f5403125ec6403a7b67aff60904aa3485583eb4315875a290431c2678

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