Malicious PDF — malware analysis report

Static analysis result for SHA-256 1614a32bdc1e2a8a…

MALICIOUS

PDF

74.9 KB Created: 2021-02-16 00:17:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e640e321d365338ade1c9bf0cc9e2223 SHA-1: 5c8c528578319535828349b62edb28b2f346ca25 SHA-256: 1614a32bdc1e2a8a3d40b58d37a2b7e0f307b9e8383ba695f1bcfd55043cc9b6
134 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maypoin.ru/wix?keyword=pre-assessment+activities+for+preschoolers PDF link annotation
    • http://xukewatamom.22web.org/87481175791.pdfIn PDF document text
    • https://cdn.sqhk.co/nozujeraguje/jbmjggc/wusalut.pdfIn PDF document text
    • https://cdn.sqhk.co/ximepadogi/giihSjg/mofodidelovixaxa.pdfIn PDF document text
    • https://cdn.sqhk.co/rijatazuga/fPhjihG/what_time_does_nascar_race_tomorrow.pdfIn PDF document text
    • https://cdn.sqhk.co/lejesapazud/XXjjfkV/major_mayhem_2_mod_apk_unlock_all_weapons.pdfIn PDF document text
    • https://cdn.sqhk.co/siwemawatu/jeIibih/xenoblade_2_blades_list.pdfIn PDF document text
    • http://sagebiwepul.22web.org/intro_after_effects_template.pdfIn PDF document text
    • http://xivagoz.22web.org/repitelefad.pdfIn PDF document text
    • http://vaxuzorokolate.iblogger.org/96213579465.pdfIn PDF document text
    • https://cdn.sqhk.co/xejoverol/5jahdGf/67778802128.pdfIn PDF document text
    • http://burutevopu.iblogger.org/hagia_sophia_museum_guided_tour.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://noxofovamoz.epizy.com/dikali.pdfIn PDF document text
    • http://pupuwejerew.epizy.com/articles_grammar_exercise_worksheet.pdfIn PDF document text
    • http://bixogonabu.epizy.com/6697042115.pdfIn PDF document text
    • http://zopefunexot.epizy.com/xanoterujumisurudonajod.pdfIn PDF document text
    • http://gezuvemun.rf.gd/ableton_live_8_suite.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_off0000ea33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA33 5348 bytes
SHA-256: c1b5a99a136b563f465f118578e30d9fd3ab86407a49598907a72b354499a405
font_01_sfnt_off0000fc47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC47 9860 bytes
SHA-256: 5fa01ecd2cb61ef41ee098ad12e1bd38edd2ec271bfb42c23ba7a9cfdb7c6f07

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