Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecde07d72c8090be…

MALICIOUS

PDF

125.3 KB Created: 2021-03-27 20:29:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a525531a73d6d270ab5ba397fb5e5920 SHA-1: 7fc73fc09cbd632498a3c0d675393917f872550d SHA-256: ecde07d72c8090be2700bc436ffc828b85144282f6ebb9e3b19f279ffe00bb79
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm. ClamAV and ML classifiers identified this as a phishing or malicious PDF. The embedded URLs and the structure suggest an attempt to manipulate search engine results or redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://lozipotod.ru/award?keyword=avitaminosis+fisiopatologia+pdf PDF link annotation
    • https://cdn.sqhk.co/gotuxixovumu/g1ggsjg/tuxotekodoza.pdfIn PDF document text
    • https://cdn.sqhk.co/lukuvekeliki/thbBghg/pugumesulitod.pdfIn PDF document text
    • http://zogigokilogipex.22web.org/tipos_de_busqueda_de_informacion.pdfIn PDF document text
    • https://cdn.sqhk.co/resilano/jchiTid/dubai_creek_tower_floors.pdfIn PDF document text
    • http://razadugufuto.22web.org/how_to_use_the_tools_in_kali_linux.pdfIn PDF document text
    • https://cdn.sqhk.co/gulizate/Tfgege3/blendoku_2_android.pdfIn PDF document text
    • http://tamizatej.22web.org/gelakepifetufot.pdfIn PDF document text
    • http://gimepar.22web.org/wexoxazojubasusiz.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/ulhcNhi/vopinaxofafikejigijek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wejifofodig.rf.gd/the_crown_season_2_episode_10.pdfIn PDF document text
    • https://6478d21b-237c-41b5-add8-96d7b9819624.filesusr.com/ugd/c7ef1a_45d0fc4d2d8a489d9efa3f13bdc960d7.pdf?index=trueIn PDF document text
    • https://044e8d80-c429-4a1f-820d-9b443c65b389.filesusr.com/ugd/53c654_3e7bc19d71e24c86b5d008eda22444b9.pdf?index=trueIn PDF document text
    • https://f6180879-d31b-499c-8e42-fead7842c491.filesusr.com/ugd/007227_c246e0d0df9c47d1ae5de136d8bb1e0b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/273ee194-d2a4-4956-ba17-1b9bf6e5fdf2/vokagomigum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e0c2f96-6ac9-40fa-9bb5-f96df2c2f15c/how_to_replace_batteries_in_a_fossil_watch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ecf7446-4a51-4de7-9895-0be0f49a6b71/8412485921.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efca60f4-54a2-487e-8af1-7d71e6cf4635/77272401189.pdfIn PDF document text
    • https://4c2674ec-1430-4cec-a455-d6a35d10586e.filesusr.com/ugd/38955b_5dfb4bd9d33c446690df0ee8b5e385fe.pdf?index=trueIn PDF document text
    • http://dirivegejapa.rf.gd/6559964762.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f153803-820c-441b-9ea0-f9f8bb76b03a/naridegogowegawufu.pdfIn PDF document text
    • https://3a0d5408-2ea1-4258-8d29-5d96341cad2c.filesusr.com/ugd/79cb75_57d4a59c06af4178b7a14ea0ae7af735.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_off0001ac50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC50 5312 bytes
SHA-256: 2d20c26589063fc4e1c19c38232225ab9b30ff56d7ce45f52a24ebe322ea429d
font_01_sfnt_off0001be61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE61 12700 bytes
SHA-256: 5962fb2fcd55c86e23b3243fd1aeb8fdade7b417d8c7eb8ba6380f1f3e5d5beb