Malicious PDF — malware analysis report

Static analysis result for SHA-256 88654104afff463a…

MALICIOUS

PDF

62.5 KB Created: 2021-06-14 03:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: be22436997387bf7b549649bb34be0c1 SHA-1: e746025d393d52ce1a71ba90d2a8acbaf154cc9f SHA-256: 88654104afff463a32c7e20021ab0e160a41921de38052b3c671dd52fe03601b
184 Risk Score

Malware Insights

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

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 0.9595

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://chcial.ru/pbw?utm_term=kkh+mod+ios PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420610/normal_606de28ecd9e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443357/normal_6020672768e82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413117/normal_6041930932ecc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391898/normal_603f0cbfd28ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402014/normal_606599b45517f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369179/normal_601306232ec77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365553/normal_60c684fe6766a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388627/normal_6038949e46704.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463034/normal_603ffa3b3884c.pdfIn PDF document text
    • https://dosarowit.weebly.com/uploads/1/3/4/3/134315771/sutaverovofo.pdfIn PDF document text
    • https://sunuzokelegawo.weebly.com/uploads/1/3/4/4/134476032/4cb373.pdfIn PDF document text
    • https://noruwapawufibem.weebly.com/uploads/1/3/0/9/130969999/siramopiniroxov_kenofose_nalapomowejol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500887/normal_605282897ff41.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fawugomem.pbworks.com/f/conan_exiles_elephant_location_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9bcabb8-0f9e-478c-871f-028121a7f40c/34209023006.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9591db8c-5e2c-427e-af5d-36fcb47b8ca1/zoom_h1n_oder_tascam_dr-05.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c06eb027-6b6d-4261-bcaa-92d8a5f542e2/86930760441.pdfIn PDF document text
    • http://pebakix.pbworks.com/w/file/fetch/144756024/dollar_tree_near_me_hiring.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3bde57f-0385-4d9d-839f-6ba1c927793a/taken_2_full_movie_in_hindi_download_filmyzilla.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/577f822d-2f83-4596-b2c2-49d14a748ca4/65885403276.pdfIn PDF document text
    • http://fudotedafeji.pbworks.com/f/cell_cycle_mitosis_and_meiosis_test_review_answer_key.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DC 4760 bytes
SHA-256: a41b4ff98f93cca4efe2725166fe42abe4da9f4782967198053febdbedf0f069