Malicious PDF — malware analysis report

Static analysis result for SHA-256 671120d19deb1968…

MALICIOUS

PDF

79.7 KB Created: 2021-04-09 22:40:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 43db7259a83dcfd4171210ba74f14c2d SHA-1: 65fc0f8ba917e58179a9dd6e35da96d646d3d6dc SHA-256: 671120d19deb19688a7264e09ac0dfffb1eb0b1a12b4f6aba02b5743c561883f
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme to obscure the final malicious destination. The document body, though heavily obfuscated, appears to contain metadata related to its generation, but no direct user-facing content. The primary attack vector is likely a spearphishing attachment leading to this malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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://bologen.ru/strik?utm_term=what+does+the+story+of+orpheus+and+eurydice+explain PDF link annotation
    • https://gizutiki.weebly.com/uploads/1/3/4/4/134478998/volipomojikaku.pdfIn PDF document text
    • https://duresanu.weebly.com/uploads/1/3/5/3/135334900/wigudisuvir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480884/normal_5ffb79dd2d2bb.pdfIn PDF document text
    • http://newyearshop.site/84340822732zessy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478123/normal_604b0ba1e7b5d.pdfIn PDF document text
    • https://gokatejasefe.weebly.com/uploads/1/3/4/6/134650338/marokosuderab.pdfIn PDF document text
    • http://fetoxuk.mywebcommunity.org/54330953632.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426972/normal_60554efcd466c.pdfIn PDF document text
    • http://itclick.pro/65661292958b4ozb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420915/normal_606b55a9a89a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482872/normal_602bfaf6ac59c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://571cbd0a-ba82-408d-be6d-2df53a8fcfe5.filesusr.com/ugd/02af14_c0c67a2eb0fc433984169a3d06f7f55b.pdf?index=trueIn PDF document text
    • https://82cb18f6-4a40-4824-ac11-10070f72ce02.filesusr.com/ugd/5aec95_960cff9989bd4b258f31242c7d9ec898.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/72820a3a-4cee-40d3-9e99-e5a1d37ecb72/craftsman_wood_planer_review.pdfIn PDF document text
    • http://tosabukevosubar.myartsonline.com/65664468586.pdfIn PDF document text
    • http://danebusuji.onlinewebshop.net/zilanofemepukakuripuni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea2174fc-64aa-4022-8b9c-c405f396427c/86317030173.pdfIn PDF document text
    • http://salajire.onlinewebshop.net/moliti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b2bee13-2b20-4a5f-be96-c78a746f2ffd/kuzifevatel.pdfIn PDF document text
    • https://9fb0fece-6c2a-4f8b-8ff1-5d9ea67f5ee7.filesusr.com/ugd/f6a907_7e3b1ccbb47642e5b54ea1b0a165ef0e.pdf?index=trueIn PDF document text
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_e34e12cefe5542c1ae1f073e1d903e60.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/31ce64ae-1873-48ce-84d6-f5a7befe5f74/how_to_cook_beef_ribs_in_power_pressure_cooker_xl.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B3 5308 bytes
SHA-256: 22b62c267dc68be8a02644ea73de01631f3621db3fd2817489cab70d5141b0d1
font_01_sfnt_off0000fbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD0 11724 bytes
SHA-256: 8e1b51d96d99c02341ca5a419a82a49e769e3334a98103aa8076338d4447cb1a
font_02_sfnt_off00012311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12311 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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