Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd26785ead4ea16e…

MALICIOUS

PDF

80.3 KB Created: 2021-06-09 18:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 16a38160894b772a96b8d1b7439c686b SHA-1: b666a669a1fb15216972d20e7a73f052b6f8b77a SHA-256: cd26785ead4ea16e7f448ac36ed456ce6d32cb13dfd1d02c4d9f575213f2b62e
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or content-luring attack.

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://kuzutuzo.ru/123?utm_term=1080p+hd+movies++website PDF link annotation
    • https://lubuminovek.weebly.com/uploads/1/3/4/5/134590555/kabam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472200/normal_60219bdf3c346.pdfIn PDF document text
    • https://posokiveborog.weebly.com/uploads/1/3/4/5/134584549/filedibom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487916/normal_60b9068ab1f11.pdfIn PDF document text
    • https://kinurilidere.weebly.com/uploads/1/3/1/3/131379896/8696335.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462986/normal_60600dbbc626a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418180/normal_5fc6c95948bc5.pdfIn PDF document text
    • https://segamivudafipem.weebly.com/uploads/1/3/2/7/132740242/9a2f77e099d.pdfIn PDF document text
    • https://nemelodanunoju.weebly.com/uploads/1/3/0/8/130874480/faviwawarejimaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390642/normal_5fedfccf754b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465263/normal_605a64ed3ea50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417305/normal_603f50610b9e8.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/7d9fdb50-2ba3-496b-9594-1cdc93498f62/general_psychology_final_exam_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f9f01f0-37b1-44bc-8e55-ca75b3abcb99/dell_studio_540_specs_cnet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bba96742-0bed-4fe6-9c1b-fe4cf4a904b9/rijoxivanenuzokazotowuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1141e97b-0afb-4adf-8c47-0127dae3566a/what_is_quality_management_plan_in_construction.pdfIn PDF document text
    • http://lakobun.pbworks.com/w/file/fetch/144968370/83805818779.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54fc81ca-0c42-4359-83c3-a76366dc1e8c/ziwiwatameda.pdfIn PDF document text
    • http://lagawiwefe.pbworks.com/w/file/fetch/144526500/how_to_do_an_appendix_in_harvard_style.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afcf9ffe-ffb4-40ca-b48a-d8485f7e855d/fnaf_gmod_map_download_free.pdfIn PDF document text
    • http://pagorevet.pbworks.com/w/file/fetch/144480492/how_to_get_pbe_account_league.pdfIn PDF document text
    • http://zutaman.pbworks.com/w/file/fetch/144891696/mediterranean_fast_casual_nyc.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_off0000fc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC37 5448 bytes
SHA-256: 4b9912243ff436d7aff586549b1fd0ab17a70effcb38b8193e455d096f4dc544
font_01_sfnt_off00010eb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB1 10964 bytes
SHA-256: 3af7cd01e1eebb60e408e2200bf8f81043d926a475b04e43b9b2f288c8867b2b