Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f43c3ae36de7d1…

MALICIOUS

PDF

86.0 KB Created: 2021-03-02 05:29:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 44b58e3b6abacfdfdfa5ca5a1c80f3d6 SHA-1: f6b7fb56508520c5439aa3d321b6664fe66754a0 SHA-256: a4f43c3ae36de7d127d8ef164c67597289f68c24de15c5caf397de9caccfcd52
166 Risk Score

Malware Insights

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

The PDF contains multiple high-severity heuristics indicating suspicious links and a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically phishing. The embedded URLs point to domains that are likely used to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://bologen.ru/strik?utm_term=thank+you+in+chinese+pronunciation+in+english PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369914/normal_600968cde7c44.pdfIn PDF document text
    • http://kataeta.club/770785378547alhj.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/common_command_prompt_commands_for_networking.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413712/normal_603164ad15f65.pdfIn PDF document text
    • http://medebupima.sportsontheweb.net/45115009453.pdfIn PDF document text
    • https://povilaromegew.weebly.com/uploads/1/3/4/4/134486615/6438933.pdfIn PDF document text
    • http://dakisemakegag.sportsontheweb.net/the_lord_of_the_rings_in_hindi_filmyzilla.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413016/normal_5fecd27c95d65.pdfIn PDF document text
    • https://nupimixek.weebly.com/uploads/1/3/2/7/132712066/dafew.pdfIn PDF document text
    • http://shopbest.online/broadsheet_hobart_2019rxwr7.pdfIn PDF document text
    • http://securityofusersdevicesonline.site/b._p_pharmacopoeia_freetey56.pdfIn PDF document text
    • https://jerolukemotib.weebly.com/uploads/1/3/0/8/130874115/c7e62.pdfIn PDF document text
    • http://palikexifumalam.mywebcommunity.org/70385955013.pdfIn PDF document text
    • https://lekomuge.weebly.com/uploads/1/3/4/7/134773229/botag.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://wekujugom.epizy.com/belgium_embassy_in_ghana_visa_application_form.pdfIn PDF document text
    • http://zotowivivakav.rf.gd/calculus_early_transcendentals_8th_answers.pdfIn PDF document text
    • http://zumaxupuvu.epizy.com/gesirebisadupeju.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78C 7760 bytes
SHA-256: 2701b4d3eb30c0a921a431aea9d545e8dcd3f307f7faae9271b58c4b4dfe56af
font_01_sfnt_off000101c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C9 5192 bytes
SHA-256: 87163e2aa5e2da4ae22d28f9362986432f0f980f5841360c4db7473db84663ab
font_02_sfnt_off0001136e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136E 13024 bytes
SHA-256: 1a639c3b389c6d7b9add31b601f79cb9cae1e2c3c42a49d8044632f9232888da
font_03_sfnt_off00013bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC7 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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