Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a2ab31d3234727…

MALICIOUS

PDF

63.8 KB Created: 2021-02-12 09:59:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 57f0a0f169122f5afd4d9ffb8e2547ef SHA-1: 2082b936d60a46ca010c3ce6aa093a3e277d341a SHA-256: 15a2ab31d323472784963322c803f68bf3a793dc8867f9ebb04ec9a3d3a2bbee
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with several pointing to known malicious redirector infrastructure and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous obfuscated links suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=glencoe+health+a+guide+to+wellness+teacher+edition In PDF document text
    • https://cdn.sqhk.co/jawubibegeba/jgSCjC2/pokemon_go_mega_evolution_calculator.pdfIn PDF document text
    • http://firstreadersclub.com/english_comprehension_passages_with_questions_and_answers_free_downloadti9yy.pdfIn PDF document text
    • https://cdn.sqhk.co/rukokota/hayijhc/cookie_clicker_hack_apk_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/vozaxodep/ih5hj6f/kovulejedibotofa.pdfIn PDF document text
    • http://technodom11.com/4615851789ijfho.pdfIn PDF document text
    • https://cdn.sqhk.co/numorolele/dKjeibR/temple_run_game_download_app_store.pdfIn PDF document text
    • http://vashmaster.info/xulofufepavagolatig9c3f.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutorixo/Siaiaij/82434746531.pdfIn PDF document text
    • https://cdn.sqhk.co/mikedeto/gjeitgf/raiderio_addon_not_updating_score.pdfIn PDF document text
    • https://cdn.sqhk.co/medipevagopu/hfOhgja/lebamadobuwugudifimax.pdfIn PDF document text
    • http://fimosabu.iblogger.org/46755559868.pdfIn PDF document text
    • http://fezibinuzot.iblogger.org/40846227434.pdfIn PDF document text
    • http://iclod.tech/black_background_imagehewse.pdfIn PDF document text
    • http://wurulef.22web.org/lubetimoninupevijo.pdfIn PDF document text
    • https://cdn.sqhk.co/jexozumumanu/eIgcwgh/didudupajom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zekubegem.epizy.com/8_dimensions_of_wellness_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/tuxubatavuripazuxilenike.pdfIn PDF document text
    • http://nowaginog.epizy.com/sijatizod.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/xunegugabetobogisuxod.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/contemplate_uk_pronunciation.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/standard_wire_gauge_to_mm_conversion.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_off0000bb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB78 5324 bytes
SHA-256: ef62209740968080519b22e8a8d911098280e5df995e345df382d7790712bc67
font_01_sfnt_off0000cda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA1 10528 bytes
SHA-256: 6cfe8dffbcbb4e69b611cafe51a7feae95090cc15f32c20a2cb0406e0fa1b904

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