Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b34619ceb56ce6a…

MALICIOUS

PDF

76.7 KB Created: 2021-09-14 04:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 2ba7d76fc3a536eff94a070aa4e6db09 SHA-1: 5e313fb0aa86e903098525c3c07e83709d115bb7 SHA-256: 3b34619ceb56ce6a551dbfe6b225e9bea411ea484eebd92eb6c441439732d62e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to a link farm, indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The primary purpose appears to be directing users to a collection of other PDF files, likely for SEO poisoning or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://av72-reklama.ru/userfiles/file/16304551977feac573fdaafa6dcede.pdf In PDF document text
    • http://www.childofafrica.org/media/userfiles/file/vimisukuwup.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/12366769345.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/vixudoziletituvedoparo.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/7580994438.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/jogazarasotagalidomupeku.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/lonasegixe.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/xatifixejodizorika.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/xobebijawovisatelowob.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/dorixiniwetenam.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/bukedovaxofigejodajebi.pdfIn PDF document text
    • https://lesura.net/userfiles/file/wivonolajedux.pdfIn PDF document text
    • https://oriontradecom.com/ckfinder/userfiles/files/92839849084.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/sasidugubi.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/77620066986.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/redoxorafolo.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/lubobogefojipu.pdfIn PDF document text
    • https://goodline.by/userfiles/file/funexagabiruwozezax.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/74249064055.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/13088487837.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/55845985163.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/zevorudexedozos.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/lolarefalifajupufofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=game+store+app+for+pcPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE108 10436 bytes
SHA-256: 12fd102aa5c9cd2bec0421cb5e361b67889a402a695f5949267bfda1cc833077
font_02_sfnt_off0000f8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C8 17064 bytes
SHA-256: 09026dabee2c331090e33d07e97988ddf240b61d2b869dd5306a052267144014

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