Malicious PDF — malware analysis report

Static analysis result for SHA-256 2af4d7d829a941c2…

MALICIOUS

PDF

76.5 KB Created: 2021-05-15 16:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6775e37d701586bca69bf77352480513 SHA-1: 957a45bf7978d1b5ec33ee238cf031c9fc96eaa0 SHA-256: 2af4d7d829a941c2e36378c1386d847d2fe7f46918192c56beae413a3d6625a2
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • 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://jumiwimov.ru/strik?utm_term=sketchup+pro+2019+crack+free+download+full+version+%2528x64+%2526+x86%2529 PDF link annotation
    • http://mabay.fun/the_lion_the_witch_and_the_wardrobe_summary_chapter_8ub8u9.pdfIn PDF document text
    • http://biotringel.shop/83539368931xq91c.pdfIn PDF document text
    • http://robertferrell.net/claro_video_apk_modk4r8w.pdfIn PDF document text
    • http://cafe-cok.ru/jaeger_atmos_clock_for_saleawrya.pdfIn PDF document text
    • http://myirn.icu/latest_walmart_open_near_mejcxdh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_97eb6f16b63940d2986053c93c2f80b7.pdf?index=trueIn PDF document text
    • https://9d50af6f-dbf7-41ba-b854-83985329a12b.filesusr.com/ugd/33c377_c8e9008701a941fbb22a9fe7f1f19047.pdf?index=trueIn PDF document text
    • https://36425c1f-c329-48aa-845d-1f8252cb45c8.filesusr.com/ugd/01d500_26058ca933254f388e2e21519c9099e1.pdf?index=trueIn PDF document text
    • https://6d8b2927-5c4d-40df-b593-c6bd35e19528.filesusr.com/ugd/1adac8_66f6a7e98f0948f3b188baeb576e6f99.pdf?index=trueIn PDF document text
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_24eecbe1513e4b1094117b40790ee045.pdf?index=trueIn PDF document text
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_d3da71139ba04cd397fe2e0ea76f7b25.pdf?index=trueIn PDF document text
    • https://11627308-8c8f-4f08-99ed-0ad85160907d.filesusr.com/ugd/682d1c_e5cfc001fda34614bf8c32f976d4c28c.pdf?index=trueIn PDF document text
    • https://27420876-d215-4860-9a72-f48db0d0c320.filesusr.com/ugd/4062c2_5b90c1c27a5b413d9b0d24a861ad328b.pdf?index=trueIn PDF document text
    • https://a49a6154-edc8-4132-95a2-c7bb8d673fe9.filesusr.com/ugd/551169_57aaf986f6aa4925b8382c7a9010bad1.pdf?index=trueIn PDF document text
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_0eb6e70e75814f25b0c8909be5318879.pdf?index=trueIn PDF document text
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_5d8355ae235b4f21a1adccf1a2ce3c32.pdf?index=trueIn PDF document text
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_e09ed00320f344bc8541fa5939904299.pdf?index=trueIn PDF document text
    • https://229c0a76-8cd2-4a6d-ad64-a548a1436bbb.filesusr.com/ugd/f9ed01_dc66308636c741c9995d945d33d4744d.pdf?index=trueIn PDF document text
    • https://b89c0965-50b5-483f-b67e-52f573158f4f.filesusr.com/ugd/1e222e_67ac404c3a104f1f87f3e985a7234cd5.pdf?index=trueIn PDF document text
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_574ae0fd21e34ef3811e34aa530699b1.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_off0000ea0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0B 6432 bytes
SHA-256: 177a0a6333e5f1376c0498d95f131abb421a1026823ad1d8bf8155ddc2228a1b
font_01_sfnt_off00010015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10015 10640 bytes
SHA-256: 16e516fd2cb8bec9c2c1f1d5e176d458aefaf7cd237d77199237bb6df4ebe9d7