Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbac233c2d23c049…

MALICIOUS

PDF

83.8 KB Created: 2021-05-22 22:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 00f320b378db4ad83c8a796113710186 SHA-1: d03120ded37f5f9191bac7dea6ce8a15d7a4dcc3 SHA-256: bbac233c2d23c049c907074223dc46c4aea0858d165bb8040e1422d043a924ea
156 Risk Score

Malware Insights

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

The PDF document contains a significant number of external links, identified as a link farm, pointing to various PDF files hosted on Weebly and other platforms. This behavior is indicative of SEO manipulation or a phishing attempt to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent.

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 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.
  • 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://botokaw.ru/strik?utm_term=how+to+prepare+for+the+high+school+placement+test PDF link annotation
    • https://pinozawekik.weebly.com/uploads/1/3/4/5/134589254/8b37c78a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374196/normal_5fec71c317db7.pdfIn PDF document text
    • https://zabutamudosuwox.weebly.com/uploads/1/3/5/3/135345211/gasoxizurubapegojom.pdfIn PDF document text
    • https://nerukime.weebly.com/uploads/1/3/1/3/131379394/gelufetilu_jemobutodopako.pdfIn PDF document text
    • https://xuzulofapoxe.weebly.com/uploads/1/3/5/3/135325887/ritikijaf-tigavizituv-buwadopa.pdfIn PDF document text
    • https://dupevikalibo.weebly.com/uploads/1/3/4/6/134659617/rakov_doxuzewaxanof_sagobalupuru.pdfIn PDF document text
    • https://takaranedo.weebly.com/uploads/1/3/4/0/134017801/714c228b764e3.pdfIn PDF document text
    • https://xekekulok.weebly.com/uploads/1/3/1/8/131857590/bemagupi-jekitikulike-lutavovajepolag-pevafakexodopiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470699/normal_6044d872da5da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476127/normal_5fedf73d23f89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412387/normal_60301459e20ae.pdfIn PDF document text
    • https://bibixofepo.weebly.com/uploads/1/3/4/2/134235383/9517448.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391899/normal_604cf8e2e8114.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373522/normal_6021786bdb46a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470832/normal_5fd8d2cc7e20d.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/babuxufarizuxur/oster_blender_food_chopper_attachment_blstac.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/2008_smart_car_repair_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/91967736208.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/how_to_download_marriage_certificate_form.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/brigandine_free_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/kahneman_thinking_fast_and_slow_summary.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_off00010b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9B 5480 bytes
SHA-256: 5a979990dd259e9e01cc339cadf19c09fdfbabd469233d8842ab0454431073f9
font_01_sfnt_off00011e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E31 10300 bytes
SHA-256: fda3cd2d880cbd9a4a62033f6783285ff340520b7f98e83cdd8f4e373063d33e

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