Malicious PDF — malware analysis report

Static analysis result for SHA-256 fde70a54a6f01295…

MALICIOUS

PDF

82.4 KB Created: 2021-10-09 20:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 94ca6999ccc2cd60bcfa203f6bcde067 SHA-1: 7364e95ad2e857c1d2800bb1370ac4656cae503a SHA-256: fde70a54a6f01295c275fb6b31116b8b1a30525c01385d390bddc59f10453a86
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, indicating a likely SEO poisoning or malware distribution scheme. The PDF structure and the nature of the URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://allineers.morefriendship.com/upload/files/tojasewemuzalasanaf.pdf In PDF document text
    • http://bonezi.morefriendship.com/upload/files/ruruwoxekaginoguso.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/naxegelalinadokiku.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/zufoziwixetagirexu.pdfIn PDF document text
    • http://lblussana.it/images/file/totibadenexurujit.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/gedopobifuvujaves.pdfIn PDF document text
    • http://farashimirooz.com/files/11516179862.pdfIn PDF document text
    • http://xn--z92bzy85x.com/userData/board/file/54938904649.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/22753740749.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/sezenuratakigat.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/fisimowasidobexoneb.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/talexivasinazu.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/fuwak.pdfIn PDF document text
    • http://lineshare.net/upload/files/20211008033121.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/kozijunixarupan.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/dagusepenumixomezomisufo.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/gogod.pdfIn PDF document text
    • http://www.og2c.com/images/file/xutedowatigonedenigipo.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/64527088896.pdfIn PDF document text
    • http://saint-party.com/media/file/senonokej.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/20211072127199581.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615cbd6ba23c6---wuloliwezonogujumizopu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=armor+of+god+worksheets+for+adultsPDF 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_off0000d965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD965 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17C 10864 bytes
SHA-256: 6de876c4326576408eda82ece8e944ab9d5fc60d8a64bdbf1e9fb479724cad60
font_02_sfnt_off00010a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A89 18396 bytes
SHA-256: e851f8c156e6fe59be692b69a5bad5b5a15afed446c90aa390986c4e5db057f0

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