Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ee9e5117f059512…

MALICIOUS

PDF

82.9 KB Created: 2021-03-07 14:56:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: ea495e8a7ffb2d34acbf6e6e6c716f76 SHA-1: fa0dd7f997eaa145ea7e6e01882cc25dd14174b1 SHA-256: 5ee9e5117f059512ef52c313df6853baec833f5062eecc6a2ed0660addc79faf
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with one prominent URL leading to a photography-related topic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xajibur.ru/strik?utm_term=how+to+take+the+best+photos+with+nikon+d3400 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4488329/normal_60015c42b5691.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486033/normal_5ffd5961c94e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368732/normal_6010dde80fd4d.pdfIn PDF document text
    • http://zuvakaxosamota.22web.org/hematology_book.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408190/normal_5fcb34e974557.pdfIn PDF document text
    • http://potegezufanizix.22web.org/gutepofa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402710/normal_5ff662c21fab6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474736/normal_600fab48e06a2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d429a7a-fd9a-4c7e-b02c-09711e585ac2/lalovulame.pdfIn PDF document text
    • http://wafubarig.epizy.com/fiwiman.pdfIn PDF document text
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_1aa9151a7ded49fb9eafbfa16f9e26e7.pdf?index=trueIn PDF document text
    • https://d5aacb37-8766-4234-9cc8-c2ec3b911aba.filesusr.com/ugd/1e723b_34d779949eb5404a912b559b811096c3.pdf?index=trueIn PDF document text
    • https://a49a6154-edc8-4132-95a2-c7bb8d673fe9.filesusr.com/ugd/551169_57aaf986f6aa4925b8382c7a9010bad1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d8b72cb-d468-4319-b648-85f9fd83ce64/hatchet_book_online.pdfIn PDF document text
    • https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_8ad5fa0a2612496281ded55256dfa541.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9598771b-43f2-489f-b296-6f8c549f1e3e/23983115576.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21a603e8-9eba-4883-baee-37615b35492b/52281656930.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14a2bd09-8d4e-42f6-b883-471df0598ded/80667561291.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/085b0635-95d3-45b2-9d58-78f1587ed1b3/what_is_the_chemical_formula_of_dna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/217b177e-ef6a-4c06-a6ad-bdd0a3b98bf5/60980768737.pdfIn PDF document text
    • https://91e55214-10ad-44cf-a10a-60a9392df58b.filesusr.com/ugd/e1c37d_f0f32d0fd4fe42b6ace300015f72f8e7.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE396 2900 bytes
SHA-256: 10a07fc969e6c8cf41398fcfefa625e426b29a45b33f3716d0886db1405c0d2a
font_01_sfnt_off0000edd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD9 5568 bytes
SHA-256: fcad1e4b567d2b2aed8f6dc92eedb4f4781af8f52a429ba3a65adb5ad5b2620b
font_02_sfnt_off000100d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D7 11072 bytes
SHA-256: d09ccef0baaa518e56fa87f40b9ff1a4a8eec5d422c938bc33d895ab206c24d2
font_03_sfnt_off00012659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12659 16496 bytes
SHA-256: acd4181b29d68d525052472755e5afedfc8871267b37ad36bc53747075f458e2

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