Malicious PDF — malware analysis report

Static analysis result for SHA-256 d68aed8cfa9d8a6d…

MALICIOUS

PDF

77.3 KB Created: 2021-02-18 20:59:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: fc9e80cea846f38bf4ee887462f00b32 SHA-1: 86c2b8c3c54d9a87e51d537a2044d0eb38243f2f SHA-256: d68aed8cfa9d8a6d86d8d1afb036aff891120f279e9061b71e11b37df71b85ea
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF document was flagged by multiple heuristics, including ML classification and ClamAV, as malicious. The 'SE_CLICKFIX' heuristic indicates social engineering designed to trick the user into executing commands, likely to download and run a secondary payload from one of the embedded URLs. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://druttle.ru/wb?keyword=why%20did%20my%20cursor%20disappeared%20windows%2010 PDF link annotation
    • https://cdn.sqhk.co/nejajevafode/jz8geij/birthday_cake_recipe_not_chocolate.pdfIn PDF document text
    • https://zapodebas.weebly.com/uploads/1/3/1/4/131437158/zajela.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403689/normal_6027fb21233fb.pdfIn PDF document text
    • https://ragusixiseditof.weebly.com/uploads/1/3/0/8/130814169/wawokebapalivakira.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486778/normal_5fd19ca393694.pdfIn PDF document text
    • https://pabifiliponisod.weebly.com/uploads/1/3/4/3/134367040/fb333b36307fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446259/normal_601f9449ceeb4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392451/normal_5fe29216bd634.pdfIn PDF document text
    • http://runmasten.online/313242748817n2xw.pdfIn PDF document text
    • https://vijujaluju.weebly.com/uploads/1/3/2/7/132741375/3f50f72.pdfIn PDF document text
    • https://cdn.sqhk.co/sejixikerut/Umge1N4/dinosaur_bubble_blower_instructions.pdfIn PDF document text
    • http://beautytopshop.site/pedesamazudowakelumixbch7q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367301/normal_5ffc2085bca16.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/figidireki/jefuxazegakagavuluwe.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/jalujibunemipurovomoroxox.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/43683419244.pdfIn PDF document text
    • http://walexesanub.rf.gd/legally_blonde_the_musical_jr_cast_list.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_off0000f0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E8 5684 bytes
SHA-256: 56554be9f4c7da07c4001fa4a06a0aca11edc2546b09b50d82e588672da41bee
font_01_sfnt_off00010434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10434 10552 bytes
SHA-256: e7b7ec29386f881f96bf25c1ad65d64815f1c8422f5c8969de553e91738de889

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