Malicious PDF — malware analysis report

Static analysis result for SHA-256 565a7a75ef6345bf…

MALICIOUS

PDF

81.0 KB Created: 2021-03-14 06:31:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 89930df692b6d11acf36c803ff07c04e SHA-1: 2da06fc64a92742f75e4f35c9b6f9284fbcaf6ea SHA-256: 565a7a75ef6345bf515635ee63ce425d554eb69b7c7cbe998a2d144f23e6b24f
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 0.9997

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://dafemum.ru/123?utm_term=teaching+articles+esl+worksheets PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417805/normal_5ff267749f752.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457296/normal_6039b882214f4.pdfIn PDF document text
    • http://mizejodaf.mywebcommunity.org/durability_test_of_concrete.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375699/normal_60430e029c38b.pdfIn PDF document text
    • http://kifopelidito.mypressonline.com/how_to_debate_video_for_middle_school.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455375/normal_5fe018da7dd49.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447433/normal_5fed7ecc7e3bc.pdfIn PDF document text
    • http://parexapubep.iblogger.org/jutilexojusazuxu.pdfIn PDF document text
    • http://bometaximom.scienceontheweb.net/yamaha_mixing_console_mg102c_manual_en_espaol.pdfIn PDF document text
    • http://sigisuzuk.getenjoyment.net/mizifodasuvobuki.pdfIn PDF document text
    • http://wegisinebirixe.iblogger.org/klipsch_r-10b_power_supply.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488581/normal_5fde745d62955.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374978/normal_60296d5fca887.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dilalixurapa.epizy.com/tuguzefoxijuze.pdfIn PDF document text
    • http://levaduru.epizy.com/2010_toyota_prius_maintenance_reset.pdfIn PDF document text
    • http://wedimotonolisu.rf.gd/how_to_hook_up_a_countertop_dishwasher.pdfIn PDF document text
    • http://tiwadelir.rf.gd/statistical_data_collection.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/66465569727.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/runanetuxusuvilexe.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/fiwizudizadirek.pdfIn PDF document text
    • http://titaleze.rf.gd/cbse_online_marksheet_correction.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_off0000fbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCC 5164 bytes
SHA-256: f5555416b49ca6e48f1bc4963ac6e2c1e933cad6af79c48a39775a8ae01fca3a
font_01_sfnt_off00010d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6B 12932 bytes
SHA-256: 6d326572678083c671110c70b6085d631ab3a4ef72b41120bd82781544db3d0b

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