Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9015bd4078864ca…

MALICIOUS

PDF

79.3 KB Created: 2021-05-01 03:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 51c59020b1cd8c6e0a8f78b1faa7d4b0 SHA-1: 187fbb15a3dad12f1ac06420664f3f45486774ae SHA-256: c9015bd4078864ca3bbfb9eb151e89e3603a5d9df572d40d61e48249f814b1a8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9996

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.
  • 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://zajinet.ru/strik?utm_term=what+are+the+words+to+the+angelus+prayer PDF link annotation
    • https://talidifixuj.weebly.com/uploads/1/3/5/3/135390844/wusuvam_sajax.pdfIn PDF document text
    • https://kutebebi.weebly.com/uploads/1/3/4/5/134528954/b940e469c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478414/normal_6054fed3b9dc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456128/normal_601d82da35aa1.pdfIn PDF document text
    • https://gupakejaxigi.weebly.com/uploads/1/3/4/5/134581176/af265b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421770/normal_60320038ddb0b.pdfIn PDF document text
    • https://cdn.sqhk.co/pulovafafita/rghOgfb/mazidufakafuwirub.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/hjdhbXw/wivojavazelutixokeka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461245/normal_60681ec0347a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461495/normal_6036cc0835c48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384820/normal_604492b3a5657.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444102/normal_60693042ac675.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420905/normal_604509008b304.pdfIn PDF document text
    • https://cdn.sqhk.co/dedenijikal/hh9hidn/baxemelarej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417032/normal_5fddf731f35c5.pdfIn PDF document text
    • https://cdn.sqhk.co/wemorapi/eN1Sj8u/xutivi.pdfIn PDF document text
    • https://cdn.sqhk.co/gigatakel/mnvidKj/22729522713.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/zikeko/i_am_wishes_fulfilled_meditation_mp3.pdfIn PDF document text
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_e77bcf7eb64c416ba6e50f3f9e8685b6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/what_is_the_starting_salary_for_a_criminal_lawyer.pdfIn PDF document text
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_29e7bdd782754101a41136529ae92d64.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/fokibavibejidifada.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_off0000f8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FA 5428 bytes
SHA-256: be2fcdaa682f99a7c4d599e4fce9ed0e19ac507ba3af85447e706d7fbdc5c026
font_01_sfnt_off00010b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B88 10780 bytes
SHA-256: fc5e9d4178c666e3d6b868f47dc83bad1832a3b218440b4eb520cee8d01a1b6a

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