Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffeff692e5148e88…

MALICIOUS

PDF

80.0 KB Created: 2021-02-16 00:03:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9a717358ee3e1ac7fd4978f60b704616 SHA-1: 52729f2bd17e038161177a5e75d7cd65e54597a3 SHA-256: ffeff692e5148e8810a548c7d0e5816f7f082c45fbe8679ac169ac2b80132fdc
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with several heuristics indicating a malicious redirector and a link farm hosted on disposable infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary attack pattern involves directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=the+bible+quran+and+science+in+hindi+pdf In PDF document text
    • https://jolesebadula.weebly.com/uploads/1/3/0/7/130740242/9db8afe99c0.pdfIn PDF document text
    • https://cdn.sqhk.co/takularozo/hAgeQgh/underworld_twisted_fate_cards.pdfIn PDF document text
    • https://cdn.sqhk.co/xutujipux/Ggjgdha/1502578326.pdfIn PDF document text
    • https://xopilujipuwoka.weebly.com/uploads/1/3/4/8/134886601/tukexakapevifuzaj.pdfIn PDF document text
    • https://cdn.sqhk.co/bonosexov/chdfVsD/4_pic_1_word_4_letters_daily_challenge.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/aicdhd7/youtube_videos_not_playing_on_android.pdfIn PDF document text
    • http://pusaburuku.22web.org/radio_advert_script_format.pdfIn PDF document text
    • https://cdn.sqhk.co/kewusikata/hdLOdeH/divanoluwoxefoteputozar.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/iYOihlC/equalizer_fx_pro_apk_cracked.pdfIn PDF document text
    • https://cdn.sqhk.co/lavopizusasu/xF9gdGl/beats_headphones_connect_bluetooth.pdfIn PDF document text
    • https://deminoki.weebly.com/uploads/1/3/5/3/135310913/e0e721a24da.pdfIn PDF document text
    • http://kimelaxuwivupa.iblogger.org/online_ckplayer_video.pdfIn PDF document text
    • https://cdn.sqhk.co/bezedono/ichiha1/tulsa_pac_ballet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://javasuk.epizy.com/fiori_guidelines_flexible_column_layout.pdfIn PDF document text
    • http://verirajoxa.epizy.com/2006_chevy_trailblazer_service_manual.pdfIn PDF document text
    • http://sudurima.rf.gd/puveravezaladinazefururof.pdfIn PDF document text
    • http://xoxozuzupa.rf.gd/kawusukuwobapazasutaranub.pdfIn PDF document text
    • http://fuvituze.epizy.com/xufolizof.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_off0000fa7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7E 5456 bytes
SHA-256: b64c21847ccb73d5d094bfa688456ac1d3040fdd798420a61f6a8d928877c016
font_01_sfnt_off00010cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF6 11252 bytes
SHA-256: 8b8328ba7621a727326f6b63bc08746570ee43fcf23f65e933e1a4330f2141d9

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