Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aa5a9a2e3ca0729…

MALICIOUS

PDF

85.6 KB Created: 2021-03-30 23:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ad7477d2ab500089ac74e03997dbbeb8 SHA-1: 659b8c60e462138a1e405fcd76a2e61952f9439f SHA-256: 6aa5a9a2e3ca0729fc8211b47454117776eb838e7c83a0ed1f8c3ff2a4ce22c1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/award?keyword=broadbent+s+filter+model+pdf PDF link annotation
    • http://ridaxaki.mywebcommunity.org/advantages_and_disadvantages_of_parliamentary_system_of_government.pdfIn PDF document text
    • https://temetufel.weebly.com/uploads/1/3/1/8/131856903/61ebd163ca0c2.pdfIn PDF document text
    • http://bipowilago.mywebcommunity.org/nobit.pdfIn PDF document text
    • http://the-english-temple.com/12_step_workbook_hazeldenqsng4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484156/normal_6011f395ab6d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465914/normal_604770296d8f8.pdfIn PDF document text
    • https://kuwovuvonix.weebly.com/uploads/1/3/5/9/135971109/xalinamudatokateviju.pdfIn PDF document text
    • https://paludiwebi.weebly.com/uploads/1/3/4/0/134012690/zizemufubajurum_wafajisiguveku_gebapitatiz_vozunogekexezes.pdfIn PDF document text
    • https://dipitamadupod.weebly.com/uploads/1/3/4/8/134882687/pajuwebu.pdfIn PDF document text
    • http://kyponnik.online/91545553053b75s5.pdfIn PDF document text
    • http://testertumentum.space/lazulidagugakmzgu1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470224/normal_60174b6b6a36e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489976/normal_600295323e00a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/senodiw/kevewadegatuj.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/54397723133.pdfIn PDF document text
    • http://bememikat.onlinewebshop.net/how_to_install_oracle_instant_client_19c_on_windows.pdfIn PDF document text
    • http://farovosodiwes.atwebpages.com/cisco_ccna_routing_and_switching_200_125_portable_command_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/how_to_reset_whirlpool_duet_dryer_sensing.pdfIn PDF document text
    • http://pasofotamuteper.atwebpages.com/palmistry_apprentice_to_pro_in_24_hours.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/difficult_linux_interview_questions_and_answers.pdfIn PDF document text
    • http://nimanexobubibub.onlinewebshop.net/how_to_price_a_used_baby_grand_piano.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_off000111c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C2 5376 bytes
SHA-256: 45606ed838617198b77af0446a76245e5032bd2abc4274e158e898e72be90b25
font_01_sfnt_off000123f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F0 10876 bytes
SHA-256: f46669c5ba6786c6ca52708e5d6a060c30089fdc1191ab39c56753f80ad4c5d4

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