Malicious PDF — malware analysis report

Static analysis result for SHA-256 e83d78e00486c4a0…

MALICIOUS

PDF

75.9 KB Created: 2021-06-09 21:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8adeca6b1c03aa8ddc5591a2406ad1c0 SHA-1: 96160dd0ff3f5de5b165b38f92425023cb70bb45 SHA-256: e83d78e00486c4a04e1de73f8219caceba486520ac78ced27078f979a274811e
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a clipboard-command (paste-and-run) lure. 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 0.9998

Heuristics 7

  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://inwebjor.ru/pbw?utm_term=mac+os+x+create+bootable+usb+from+iso+windows+10 PDF link annotation
    • https://movediwifed.weebly.com/uploads/1/3/2/6/132695881/viretetuv_jivubom_selolodaja_zokowura.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415292/normal_603ad3f502bbf.pdfIn PDF document text
    • https://peguwuxawotenu.weebly.com/uploads/1/3/4/5/134582441/6550789.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381766/normal_602bfb7cbe500.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451566/normal_601e580b98155.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426699/normal_5fda912a615b0.pdfIn PDF document text
    • https://vatipasa.weebly.com/uploads/1/3/0/7/130775610/labuxenufekokotisa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476938/normal_606a62de9b825.pdfIn PDF document text
    • https://kubegagalinono.weebly.com/uploads/1/3/4/7/134714436/1c55c61ca53beb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465128/normal_6025e8fc97ec1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487423/normal_6011df2b64e2a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491157/normal_5fee23072a0c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411921/normal_5fdb69716f81a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471992/normal_60410231e6b5a.pdfIn PDF document text
    • https://jipujiro.weebly.com/uploads/1/3/1/0/131069764/lekuwisezikadi-sowigejidod-nevatired.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473638/normal_60450b5611ebb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pejuzor.pbworks.com/f/what_is_dna_middle_school.pdfIn PDF document text
    • http://morabef.pbworks.com/f/fce_listening_exam_with_answers.pdfIn PDF document text
    • http://podixarutib.pbworks.com/f/texisisoxowigaje.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_off0000e819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE819 5664 bytes
SHA-256: 2ea02c8688bf7f702a6e8dc1158b3d0c269314a11ec7567bea8d9319fa2ffafc
font_01_sfnt_off0000fb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6E 11196 bytes
SHA-256: 605680f2ed83ce792bd61b9873ed4e99760731da163a6b40522ca297029d4626

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