Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a4c1b96d5e51886…

MALICIOUS

PDF

91.4 KB Created: 2021-02-26 21:56:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: b09c234660ca39243d763add477ece6d SHA-1: 6c657adb8545bf165c8a45706a0816dacddfc6c1 SHA-256: 5a4c1b96d5e518861c7371dcfedb01680678c31f9569a31bb8f8139a316b327d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or content-luring campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

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://golowaki.ru/strik?utm_term=alimentos+y+bebidas+con+prote%25C3%25ADna PDF link annotation
    • http://kukushka.space/prepared_2_protect_pepper_rounds99nbw.pdfIn PDF document text
    • https://kunimagim.weebly.com/uploads/1/3/4/6/134608209/rewiratutumo.pdfIn PDF document text
    • http://niwawopomovaz.22web.org/42243026001.pdfIn PDF document text
    • http://slampochka.ru/jquery_ajax_complete_tutorialteqt8.pdfIn PDF document text
    • https://cdn.sqhk.co/kukisigafumi/cjj87wH/difference_between_plants_and_animals_venn_diagram.pdfIn PDF document text
    • https://cdn.sqhk.co/baxijaxazixi/L8364gj/talking_t_rex_dinosaur.pdfIn PDF document text
    • https://cdn.sqhk.co/zupivikeg/gcgehhN/fashion_beauty_sv.pdfIn PDF document text
    • http://sarkife.site/893024280681ci6g.pdfIn PDF document text
    • http://xofajenakimexo.iblogger.org/assamese_dictionary_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446035/normal_6003dde8c46a4.pdfIn PDF document text
    • https://xexemisekugo.weebly.com/uploads/1/3/4/6/134679242/nonuv_nutaxan_kuselarujuwe_xifuxipagi.pdfIn PDF document text
    • http://nashremont.site/ssf2_sasuke_modz8ywr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://muvasusug.epizy.com/furosemide_medication_guide.pdfIn PDF document text
    • http://datasixiva.epizy.com/90786110881.pdfIn PDF document text
    • http://fojinejadasetax.epizy.com/android_phones_unlocked_for_sale.pdfIn PDF document text
    • http://nigaxatu.rf.gd/senorita_guitar_tab_sheet.pdfIn PDF document text
    • http://fusizukokumov.epizy.com/5136617629.pdfIn PDF document text
    • http://kixomeremit.epizy.com/87460893314.pdfIn PDF document text
    • http://kafafisizufol.rf.gd/organic_chemistry_david_klein_3rd_edition.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_off000125f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F5 5504 bytes
SHA-256: 5a2588e981e91a39e094c6d488d739c9d03d05d9cdf43a73a777695a6aeb95aa
font_01_sfnt_off0001389e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1389E 11616 bytes
SHA-256: 101825d1b7d2c147cdbfd6825962eb45c03872da10a294cb0ce539ea552fb802

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