Malicious PDF — malware analysis report

Static analysis result for SHA-256 670ac9cbb5fd0a06…

MALICIOUS

PDF

76.4 KB Created: 2021-03-28 15:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c18a1349bb603dbd2d921de888773eed SHA-1: 1f56c773243a567dffe8572ddfb0ebeea8c86805 SHA-256: 670ac9cbb5fd0a067bc910eb073653b1dd69432286b0b5e06815cd07a1ef15c2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/strik?utm_term=the+laugh+of+the+medusa PDF link annotation
    • https://jadilojapup.weebly.com/uploads/1/3/5/3/135313437/e0249bb4fa25fd1.pdfIn PDF document text
    • https://kaxesudinebeg.weebly.com/uploads/1/3/1/3/131379803/4691293.pdfIn PDF document text
    • http://wedasuf.getenjoyment.net/ubah_ke_word_candy.pdfIn PDF document text
    • http://rumigiwataj.getenjoyment.net/psicologia_de_la_emocion_uned.pdfIn PDF document text
    • http://rajajime.mypressonline.com/dirk_gently_s_holistic_detective_agency_download.pdfIn PDF document text
    • https://marikiwow.weebly.com/uploads/1/3/1/3/131379510/439910.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479932/normal_600e5c7bc8a49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413011/normal_5fe857795fb24.pdfIn PDF document text
    • http://pejazadajenatew.getenjoyment.net/28849884389.pdfIn PDF document text
    • https://forugizatufuru.weebly.com/uploads/1/3/1/4/131410167/4799665.pdfIn PDF document text
    • https://lowezikalazana.weebly.com/uploads/1/3/0/9/130969016/1040742.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477386/normal_600f5a57f0407.pdfIn PDF document text
    • https://penopetidurip.weebly.com/uploads/1/3/2/8/132815040/zakipejenom_xilix.pdfIn PDF document text
    • https://todatotosikuped.weebly.com/uploads/1/3/0/7/130740429/3095422.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_29f41bec4e7e48339c81deae3db90372.pdf?index=trueIn PDF document text
    • https://48936d5e-4b15-4059-a328-ddb12afcc15e.filesusr.com/ugd/173145_8082bdc352714485b49edb1e1238f88c.pdf?index=trueIn PDF document text
    • https://2e4d99de-9d37-4ce2-abd5-0bbccafdbe51.filesusr.com/ugd/33a2e4_8ce572abdd814260a7e75aff67decd3a.pdf?index=trueIn PDF document text
    • https://a2fe464c-28d1-4db8-bb2d-552ad9bc2f4d.filesusr.com/ugd/941bb1_4f40502f01d84ef69aa28d71c19cec69.pdf?index=trueIn PDF document text
    • https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_2c126035de5c4ca6a66c2394f9744ee4.pdf?index=trueIn PDF document text
    • https://3ff4c494-4984-418a-b709-7a5c611cca0a.filesusr.com/ugd/adbee0_ee41b83bdbde4cf68b050f878f930645.pdf?index=trueIn PDF document text
    • http://panexorumilogim.myartsonline.com/dogelog.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_off0000ef3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3B 5176 bytes
SHA-256: a9ee4ba6c729bea4483c2aee621384bf6d56b8c2e8e7672463e25ca7f70a3b13
font_01_sfnt_off000100b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B7 10836 bytes
SHA-256: 062c29ea85de9c5555c045d33b1c1ca1efab143aa615ceeeb10946c80947dfb3

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