Malicious PDF — malware analysis report

Static analysis result for SHA-256 6858e77ffa281799…

MALICIOUS

PDF

83.0 KB Created: 2021-02-24 07:31:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9b3f0fe9bced479e0629dd755a039627 SHA-1: 3a0383f70dab6392af5451c67b70229262c23b3f SHA-256: 6858e77ffa28179909c9d84bd4026973da6f522b154d63ec5d48ab690a9391aa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, indicative of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to drive-by downloads or lead users to credential harvesting pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://druttle.ru/strik?utm_term=camila+de+que+me+sirve+la+vida+letra+video+oficial PDF link annotation
    • https://zikepasut.weebly.com/uploads/1/3/4/1/134108801/lurakovefijobas_jafukoxaxujevul.pdfIn PDF document text
    • http://hookup157.online/vokezusafiviwivezopantksfv.pdfIn PDF document text
    • http://xovekofetovo.66ghz.com/transcribe_audio_to_text_apk.pdfIn PDF document text
    • http://instapriz.online/316232176399v7wl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371272/normal_602d7b84216b3.pdfIn PDF document text
    • http://xbet1.fun/luhr_jensen_little_chief_smoker_manualmj66f.pdfIn PDF document text
    • https://jewajufigojoxi.weebly.com/uploads/1/3/1/4/131438211/vixog-pusedujozurexot-mapikozunego.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420020/normal_60357ba21f984.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470687/normal_5fd9050944e36.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387929/normal_5fd048752eb3f.pdfIn PDF document text
    • http://bivisurat.22web.org/gegoreribamunefetikener.pdfIn PDF document text
    • http://mklhhhh.space/marketing_plan_template_for_real_estatee0ikx.pdfIn PDF document text
    • http://xinumazujo.iblogger.org/cd_dvd_cover_creator_free.pdfIn PDF document text
    • http://arnautmebel.ru/aetna_international_claim_form_hong_kongiw3uu.pdfIn PDF document text
    • http://digitaltoolsfor.xyz/52965101136ngv2r.pdfIn PDF document text
    • https://sekitajed.weebly.com/uploads/1/3/1/3/131383533/konugo_luzuxul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jilagikudi.rf.gd/daily_attendance_record_template_free.pdfIn PDF document text
    • http://zoloxufiz.epizy.com/7274363942.pdfIn PDF document text
    • http://rurubafemiw.rf.gd/bofiziwuxa.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD716 5152 bytes
SHA-256: 4881f1af4132ade0ab9c61a530adcb33d4e645c358d82d1d981b2a8519dd811b
font_01_sfnt_off0000e89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89D 1888 bytes
SHA-256: 3db0edf0d6764ac3b5c075e51844234502b2ca99c825d09852fc8733abb3e66f
font_02_sfnt_off0000f1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B0 11908 bytes
SHA-256: d32398c9d710a49e9c2dfea092b826f88a6af48da5d3d663435601bb0a4e45bf
font_03_sfnt_off00011853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11853 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2
font_04_sfnt_off00012d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1A 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f