Malicious PDF — malware analysis report

Static analysis result for SHA-256 09f374d9c501cabd…

MALICIOUS

PDF

79.6 KB Created: 2021-03-28 17:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 35c780bef9a3700ab70eea1c8ba2d9e8 SHA-1: cf054754dc1a42142171f14b1d59c5b5367742d2 SHA-256: 09f374d9c501cabd7416ba4cf943598532d18d6f679fbf08330eb0e238f05300
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 0.9993

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=how+to+reorder+pages+in+pdf+acrobat+pro PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4373526/normal_5ff2abdff36c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487192/normal_5fe4d24bb92c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476015/normal_6042e01752cb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486745/normal_603b669550eda.pdfIn PDF document text
    • http://lakegefufen.scienceontheweb.net/metabolismo_basal.pdfIn PDF document text
    • http://tibudirowe.mygamesonline.org/bratislava_guida_turistica.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413468/normal_602f377a54625.pdfIn PDF document text
    • http://veruvipavopa.getenjoyment.net/agricola_tacitus.pdfIn PDF document text
    • http://wovoradomumakil.medianewsonline.com/business_plan_example_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491686/normal_5fe41f081b447.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458431/normal_5fd6351501215.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_4a32e856d3db49309c88bbbe5d3c0b35.pdf?index=trueIn PDF document text
    • https://b42dfab6-8227-42c4-8fe5-fc04d9433513.filesusr.com/ugd/a9a8df_3ec416609f3c4af88e039e7889d9e145.pdf?index=trueIn PDF document text
    • https://504706c9-3a86-45eb-876a-6494ef133fff.filesusr.com/ugd/80c1db_40661d3e00fc47ca8233aa8458ac656f.pdf?index=trueIn PDF document text
    • https://e966359d-176b-477a-9ad9-c314bea94227.filesusr.com/ugd/fa6f14_f0ea8c47b8634c98a564060c21d2cd7e.pdf?index=trueIn PDF document text
    • https://6b54b0b2-91db-43cc-88c8-bbc4f7e20b37.filesusr.com/ugd/a773aa_dc74ecbb45b94c329b66d1d11308ac34.pdf?index=trueIn PDF document text
    • https://ccd4a2e6-63e2-4dcb-a02e-1ae1253dabcc.filesusr.com/ugd/059ff1_6dca8a76ca234817bb9a57107acd97d0.pdf?index=trueIn PDF document text
    • https://91e55214-10ad-44cf-a10a-60a9392df58b.filesusr.com/ugd/e1c37d_d1e64ef5c3ab44a8b7306b104aa083f7.pdf?index=trueIn PDF document text
    • https://4c8e72c6-e2e3-4108-adc6-102de481692d.filesusr.com/ugd/f4b4ca_604afaa8340e42a7b8991040e8b0e4d3.pdf?index=trueIn PDF document text
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_a207bee4c4ea43a788c6ce5c242da1ab.pdf?index=trueIn PDF document text
    • http://pimobepetokonud.myartsonline.com/zemageroxe.pdfIn PDF document text
    • https://f64a1a0a-debf-4843-a838-a34c0cae0f4a.filesusr.com/ugd/89602e_c17918d455ba45c1b6cbd57ee2e60490.pdf?index=trueIn PDF document text
    • https://bf808793-8b46-4c54-8b11-319763181fa0.filesusr.com/ugd/0d018b_8651a87e1c734247866c0ef8299806d1.pdf?index=trueIn PDF document text
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_0b909f13b7374b2782ef78aeafabc862.pdf?index=trueIn PDF document text
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_4e28a2f7aae84841a0aef7221732f917.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_off0000f4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FD 5484 bytes
SHA-256: 4491a785626c6419cbcca3746ad59273f412472e6abeae58d8a688eae64afab1
font_01_sfnt_off000107c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C1 11764 bytes
SHA-256: 7736baf5e1b7278f6a4b48a8ec325f887124ea88fc209d913a1cdaa3efe97ed5