Malicious PDF — malware analysis report

Static analysis result for SHA-256 e77174e954ad8f30…

MALICIOUS

PDF

77.0 KB Created: 2021-03-22 19:11:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c0139b56d05afcae9e66b220a80b38e3 SHA-1: 9c4af9805d8758574c258ce77f6b31876aaefdd7 SHA-256: e77174e954ad8f3051bfb8dc45a34ca6dd0309b485b05fab6b6fcc54d76fff03
186 Risk Score

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 0.9997

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://xezojetit.ru/award?keyword=blank+index+page+pdf PDF link annotation
    • http://numberoone.xyz/cool_popular_ringtones_2020_top_100_songsieg3p.pdfIn PDF document text
    • http://romeita.space/video_conferencing_software_free_download_for_windows_10pz7j8.pdfIn PDF document text
    • http://opros.xyz/easy_arabic_grammar_free_download_in_urduxpub1.pdfIn PDF document text
    • http://probkin34.xyz/fanodanojupugojikuxafutiaxyqn.pdfIn PDF document text
    • http://7lessons.website/john_maxwell_change_your_worldl1v5f.pdfIn PDF document text
    • http://neyroskakalka.site/16137032234u8gv5.pdfIn PDF document text
    • http://ig-copyrightnotice.com/easl_guidelines_pscd848l.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/80902c58-6614-48b9-9589-997dc56ff396/what_are_some_startup_ideas.pdfIn PDF document text
    • https://c4bedd8b-a3e9-4aa8-9751-a6fde4035b7e.filesusr.com/ugd/037f08_6d4faaab5b3c4b399f878dae97064e04.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c468fd7-d544-4146-a155-297acc5ba276/76828479343.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d18f93bd-45d5-4f0d-acf2-e3fd005646aa/kasakuvakivexafi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c62758a0-f6fc-4370-bed6-b01261f61d41/mary_j_blige_my_life_zip.pdfIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_db3f660979f441f8ae02c63ca93fa2dd.pdf?index=trueIn PDF document text
    • https://4fe85328-8dbf-40e9-afa8-2c8d6ff8a9c8.filesusr.com/ugd/9c0842_8991fb627eb649ebb96a4c9f64e33ef8.pdf?index=trueIn PDF document text
    • https://98771922-91e4-4673-aa0d-7794f4435593.filesusr.com/ugd/b6aaa0_d421ba62e3f748af8c581a92ceca8e6d.pdf?index=trueIn PDF document text
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_b18249a5162b4933a8ff69a5dc177344.pdf?index=trueIn PDF document text
    • https://645c32c3-7e99-4959-b93b-7980205539d7.filesusr.com/ugd/30a31c_2e49846d2891462abf604f95ffb87043.pdf?index=trueIn PDF document text
    • https://79e5ec13-148a-49e7-9308-7b7844992bd9.filesusr.com/ugd/1d149b_24dbe8425bfe4affb875f6fbb2234072.pdf?index=trueIn PDF document text
    • https://14e2190e-1c7c-401b-bdd1-4e50d95f8180.filesusr.com/ugd/62a579_d188611fd77745fb9f7dd61dd692fee1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/41431dae-299a-4a42-9572-bb8910529c7a/zanosixirewedewogodulede.pdfIn PDF document text
    • https://0efdb04f-128a-4c0d-ace4-8b312723ebcc.filesusr.com/ugd/5508f4_91e9d76118234c6fb447f4391b49b3a9.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3A 5116 bytes
SHA-256: ff56150c9c4bff3f8afc5522e831dc793f57907dcb255b11e741e2aad0823db1
font_01_sfnt_off0000ffca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCA 11552 bytes
SHA-256: 344cb21871013ee4627350af4ff70c56b3cb5320168c38e1106f885000fc6d74