Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fd68ef90427827e…

MALICIOUS

PDF

79.1 KB Created: 2021-04-08 21:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 109e71bdfba53590b34cf4baf5f0ad2b SHA-1: 0cb7ae242f49b132d46f292348264c1d9bd9ba38 SHA-256: 6fd68ef90427827e2689b11d67ccb3a5989386b3da1bc5e0708cb17d2acd3ae0
126 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful 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
  • 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://nipisod.ru/strik?utm_term=how+much+does+it+cost+to+get+in+altitude+trampoline+park PDF link annotation
    • https://cdn.sqhk.co/fuwifemi/gchgkja/the_finger_family_song_nursery_rhyme_lyrics.pdfIn PDF document text
    • http://zarabatyivat.ru/lemakigepiwapof10kh.pdfIn PDF document text
    • https://cdn.sqhk.co/tigugobe/hz6ighx/ampere_pro_apk_3._18.pdfIn PDF document text
    • http://apkweb.net/affirmative_defenses_listznso8.pdfIn PDF document text
    • http://usersonlineguardingsettings.site/pikisajamuzixotlg8ph.pdfIn PDF document text
    • https://guxojifupu.weebly.com/uploads/1/3/1/4/131438233/besewozasi.pdfIn PDF document text
    • http://webpost.pro/dream_home_board_game_varietystreaming7t3cc.pdfIn PDF document text
    • https://cdn.sqhk.co/dofofigeniso/3idibtt/28666577583.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421350/normal_5ff9ede77a331.pdfIn PDF document text
    • https://vuginavoji.weebly.com/uploads/1/3/0/7/130775358/zemoborigawixu.pdfIn PDF document text
    • http://fbcopyright-center.com/holmes_aer1_air_purifier_towerhrpbu.pdfIn PDF document text
    • http://natlab.ru/mipirulitexasipumoxobubin1jvsq.pdfIn PDF document text
    • http://redirunna.xyz/vokakejuimj3s.pdfIn PDF document text
    • https://kufepodesaf.weebly.com/uploads/1/3/4/3/134336702/fesel.pdfIn PDF document text
    • http://vedice.ru/jolopamanepivoj6299b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480753/normal_600ea17a647dc.pdfIn PDF document text
    • http://ruszaimclub.ru/ley_1010_del_2006u1scv.pdfIn PDF document text
    • https://zokukomusisitu.weebly.com/uploads/1/3/5/3/135323242/jajijozidokanopul.pdfIn PDF document text
    • https://kanevuto.weebly.com/uploads/1/3/4/4/134484588/salekivajizasa.pdfIn PDF document text
    • http://load-bcp.com/sonic_shake_sizes_ozk6q23.pdfIn PDF document text
    • https://cdn.sqhk.co/xobupiba/diejVjd/ncct_study_guide_for_medical_billing_and_coding.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482671/normal_60653fc4d82c2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31F 5604 bytes
SHA-256: 2ad2016c3fa53287db62b3719c74b2f2c4acdf33cd62a3fe7980e3f8b38b8cd3
font_01_sfnt_off00010611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10611 12016 bytes
SHA-256: 2f1de5ee58a7dbbba56b5d18574e7bc41a1c6c35b91bf5ad296d8eff363612b4

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