Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dd1c57d93c0191f…

MALICIOUS

PDF

105.1 KB Created: 2021-04-19 13:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7a0833aedd67b1d7cc85df0b8a13bde9 SHA-1: b71c08a19e9ceb2a10a70893d81788b86674c55e SHA-256: 7dd1c57d93c0191fa6c17644800bec6254d8bf5347fe1d65fb9afa8dd0431cd4
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF document detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('nipisod.ru') and containing UTM parameters, suggesting a phishing or malicious redirection attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm hosted on disposable domains, further supporting a malicious intent to distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/strik?utm_term=overeaters+anonymous+12+steps PDF link annotation
    • https://cdn.sqhk.co/jasowipe/iihd4AB/pidamanudufanoro.pdfIn PDF document text
    • https://cdn.sqhk.co/bamebuxi/aibhiYB/cadence_of_hyrule_ost.pdfIn PDF document text
    • https://cdn.sqhk.co/vimerokil/hgjieib/pokemon_hd_wallpaper_pikachu.pdfIn PDF document text
    • https://cdn.sqhk.co/dasekizob/iWFihgr/36030413271.pdfIn PDF document text
    • https://cdn.sqhk.co/wunasesev/JLYidct/85428240444.pdfIn PDF document text
    • http://rawoxaxevog.mygamesonline.org/how_to_change_the_belt_in_a_shark_navigator.pdfIn PDF document text
    • http://mukinumatonewo.getenjoyment.net/wixezowi.pdfIn PDF document text
    • http://xedijama.getenjoyment.net/angularjs_2._0_tutorial_download.pdfIn PDF document text
    • http://viwafuxofiseko.getenjoyment.net/antrenmanlarla_geometri_2._kitap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_24efd1b525804bebbc553e2010d0a771.pdf?index=trueIn PDF document text
    • https://f11c4bf2-12a6-49f8-9590-07a94b689168.filesusr.com/ugd/11276f_02f59e1409de429293d6ce37a2bbadd8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/061d7529-0988-4cea-bd69-425b8ac8e479/what_if_book_series.pdfIn PDF document text
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_7999e812aebd44b8a6235ee2b852d3a2.pdf?index=trueIn PDF document text
    • http://fajegexowesidet.rf.gd/tribes_seth_godin_download.pdfIn PDF document text
    • https://ececae0b-1312-4a4c-959a-117928b3d478.filesusr.com/ugd/e6721e_9b2289543b0c4b4cb67777be47a526cd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mejados/deductive_method_lesson_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/ford_mustang_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b3afb85-dcc8-4af7-bfb7-7f7f01adb60d/john_deere_317_mower_parts_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/49722834952.pdfIn PDF document text
    • https://8c0e102b-efba-4641-b7fc-347c26357927.filesusr.com/ugd/d420ee_a82d93e7514e408b8d196ab034128728.pdf?index=trueIn PDF document text
    • http://bafowixo.rf.gd/67539313280.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d40f9bb8-aba5-4edb-9ede-24cdcb53958b/55496489941.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eabc183b-088a-48e5-8807-3c6859585bff/arduino_nano_3.0_schematic.pdfIn PDF document text
    • http://pulawev.epizy.com/letter_of_resignation_template_word_2007.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/tiripeviniwevobusuvo.pdfIn PDF document text
    • http://bavalididot.epizy.com/novel_ahimsa_azaleav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9282dbb3-d20b-44a1-b4d6-0ceeb7068f0a/givuxex.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_off00015f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F10 5304 bytes
SHA-256: 1ea646830cf9cc4a632ed07d1c90b8ca05503e55cf39ff99998a759dc74c815e
font_01_sfnt_off00017115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17115 10892 bytes
SHA-256: 251548d86431ecd959eeda5f768ddcff3ee59bb185ba34da38a0f14ef13ea45d

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