Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee552626a5de00be…

MALICIOUS

PDF

73.0 KB Created: 2021-03-07 08:51:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: d759b6a5a23e898a85c9186bbb9d2a7d SHA-1: 45b29a3099163fe7d8e51f08d0eea5437d66b682 SHA-256: ee552626a5de00bec3c4adc33ce0920b72c14dd7ed19149ccdb5dcd0f3db19d8
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains text suggesting it is a lure for a "Phrasal verbs dictionary pdf free download". The presence of numerous external URIs, many hosted on disposable domains, further supports a phishing or malware distribution scheme. No scripts were extracted from this sample, but the PDF structure and embedded URIs are indicative of a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://maypoin.ru/strik?utm_term=phrasal+verbs+dictionary+pdf+free+download PDF link annotation
    • http://yellownatural.space/rirafusevabipitavokodumt3l4.pdfIn PDF document text
    • http://oneitshop.info/vidyasagar_songs_tamilloe6k.pdfIn PDF document text
    • http://dragonflysagewellness.com/depopanibinanijeeev3e.pdfIn PDF document text
    • https://jifofavara.weebly.com/uploads/1/3/4/6/134631997/9301997.pdfIn PDF document text
    • http://mybestchan.online/tasedoni1pg6v.pdfIn PDF document text
    • https://lezevonunibo.weebly.com/uploads/1/3/4/5/134577944/9027705.pdfIn PDF document text
    • http://lngcliente.com/2930007591653cmy.pdfIn PDF document text
    • https://jatevabuxises.weebly.com/uploads/1/3/5/3/135382810/b13e4466373.pdfIn PDF document text
    • https://kofodurulivikaf.weebly.com/uploads/1/3/3/9/133997487/sozesem-xojiki-niwavoxipisunej-jujopaz.pdfIn PDF document text
    • http://itravelgr.com/ti_nspire_cx_cas_software_free_download921qo.pdfIn PDF document text
    • http://stroiline74.ru/lcvp_work_experience_diary_templatelfmdr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e285f9e5-0c05-451a-b026-7c8ae8e4b996/social_media_marketing_plan_definition.pdfIn PDF document text
    • http://titaleze.rf.gd/hoover_steamvac_hose_repair.pdfIn PDF document text
    • http://woriloxalodar.rf.gd/aisc_seismic_design_manual_2nd_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19d66cd5-7a39-403f-ad8f-7777ba3b1521/68850579601.pdfIn PDF document text
    • http://wisivajenujeza.rf.gd/aircare_humidifier_filter_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/917d164b-16ba-4138-bc64-80d1da1b0e46/93924314844.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38178d75-ae7f-4c24-b872-44f51a24ff71/nezufapovubusijerobeme.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_off0000da18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA18 5636 bytes
SHA-256: e5c3e0c39f594c843f8222e0f81d57fa9a6b0ce84c3b5813dc14c1c10f2b708d
font_01_sfnt_off0000ed53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED53 11632 bytes
SHA-256: 2581438c74c3a3c30707f7a115896e2dc5edc73b5d562735387b722c011cae75

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