Malicious PDF — malware analysis report

Static analysis result for SHA-256 9398b8bcab61f4d7…

MALICIOUS

PDF

74.8 KB Created: 2021-01-20 05:43:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7ace9e74bcb0a4823785032498de0b68 SHA-1: 6b9dff1225b46b210fa258911a8527dee2769694 SHA-256: 9398b8bcab61f4d7adb690e32f63dc3bb3be5bf4c58cb367b17241fcbcaeea0e
216 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for brand-impersonation credential phishing targeting 'Target'. The file contains a large number of external links, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the presence of external URIs and the phishing lure indicate an attempt to redirect the user to a malicious site for credential harvesting, likely exploiting a PDF vulnerability.

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
  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://bodujifoji.weebly.com/uploads/1/3/5/3/135394102/9ee20d5d55dc9b.pdf.
  • 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://trafficel.ru/aws?utm_term=guideliner+navigation+catheter PDF link annotation
    • https://bodujifoji.weebly.com/uploads/1/3/5/3/135394102/9ee20d5d55dc9b.pdfIn PDF document text
    • https://subusigigug.weebly.com/uploads/1/3/5/3/135316146/josel.pdfIn PDF document text
    • https://lufukosiresefo.weebly.com/uploads/1/3/4/7/134707539/2900b49218a05.pdfIn PDF document text
    • https://site-1166749.mozfiles.com/files/1166749/76128144338.pdfIn PDF document text
    • https://site-1176306.mozfiles.com/files/1176306/jezudixanugib.pdfIn PDF document text
    • https://site-1245653.mozfiles.com/files/1245653/sara_bareilles_brave_sheet_music_free.pdfIn PDF document text
    • https://fubudebuz.weebly.com/uploads/1/3/2/7/132712336/e566e3f8ee7.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/jupudizadid/a_b_z_forms_of_dna_ppt.pdfIn PDF document text
    • http://tefesapebeto.rf.gd/derusimavusuvesad.pdfIn PDF document text
    • http://mevedokepovi.epizy.com/como_converter_em_jpg_online_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/memexelu/90310137861.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/free_hd_movies_2020_app_download.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/93972815500.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/synonyms_for_formal_approval.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/39214014357.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_off0000e505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE505 5116 bytes
SHA-256: 1fc7681cdce3dc69308103ae10c0f6d8f294442bd8567da54560c6b57b96cc95
font_01_sfnt_off0000f66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66B 11100 bytes
SHA-256: 7ffbfe4d79112d2d77eaf5256749459fe21195ff3aaeba44e9997f2b05fe44a1

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