Malicious PDF — malware analysis report

Static analysis result for SHA-256 4821fbc25441983f…

MALICIOUS

PDF

72.7 KB Created: 2021-02-23 20:10:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 23b9788a8189d703faccfba510bd1c20 SHA-1: 1541e93eadddc23a7429b2d3a003eff950c8f11c SHA-256: 4821fbc25441983fcf230457eb4d34066742326dea2c6b316c928422b0d64bb0
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://jacksth.ru/123?utm_term=what+is+the+best+viper+alarm+system PDF link annotation
    • http://natural-shop.info/navigation_drawer_android_developer_blogx8ppp.pdfIn PDF document text
    • https://tixasenuwafoja.weebly.com/uploads/1/3/4/6/134658158/witumogux-kexutunusaw-kuvigodope.pdfIn PDF document text
    • http://serdyukov.pro/zoxomfzjnd.pdfIn PDF document text
    • http://zalofamanaw.22web.org/wuvizazejabusukebitub.pdfIn PDF document text
    • https://fezuwarojeti.weebly.com/uploads/1/3/1/3/131383544/c161f0cf549c677.pdfIn PDF document text
    • https://xuvifadeto.weebly.com/uploads/1/3/2/6/132682806/fovak.pdfIn PDF document text
    • http://my-favshopf.online/bhagavad_gita_in_english_full2504t.pdfIn PDF document text
    • https://zejenabo.weebly.com/uploads/1/3/0/9/130969472/zuvirurupikugab.pdfIn PDF document text
    • https://gisogademumes.weebly.com/uploads/1/3/1/3/131379615/zubebazojusesodad.pdfIn PDF document text
    • https://komijeji.weebly.com/uploads/1/3/1/6/131606126/jedupanemepezexames.pdfIn PDF document text
    • http://uptodate.site/what_is_the_purpose_of_a_topic_sentence_in_informational_text1fdgx.pdfIn PDF document text
    • http://cleaner360.shop/shelter_island_real_estatepa7bb.pdfIn PDF document text
    • https://wamazuwo.weebly.com/uploads/1/3/1/3/131380988/ruviwabetine.pdfIn PDF document text
    • https://zesumijiwad.weebly.com/uploads/1/3/0/7/130739983/4545322.pdfIn PDF document text
    • http://sedouche.xyz/45881153293skq61.pdfIn PDF document text
    • http://janetoxanonim.22web.org/tesaviwiwalegixasivu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tefinavi.epizy.com/50591096057.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/62028999195.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/format_authorization_letter_process_documents.pdfIn PDF document text
    • http://texazufuvo.rf.gd/2019_covered_california_income_guidelines_2018.pdfIn PDF document text
    • http://sonasekofuxix.rf.gd/cal_mol_to_cal_g.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_off0000df18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF18 5376 bytes
SHA-256: 8c80a9bddbfd7807ccd9ed42a4f7f6386794f60120fbe6de608628fd31e6a28c
font_01_sfnt_off0000f146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF146 10568 bytes
SHA-256: 00ee14242066f88c243a7a3fbf121006466fdabcbc5ee415762395d2598187c3

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