Malicious PDF — malware analysis report

Static analysis result for SHA-256 648a50ef8cb498be…

MALICIOUS

PDF

83.4 KB Created: 2021-03-27 16:31:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 859b1c36b1a4a283db521803713bf155 SHA-1: 15c7b7ff9479302a6344c05b0f3bad3807a003e5 SHA-256: 648a50ef8cb498befac2ac5b817d539857cfe8a1cfd11b8ce2ddf22d3318b607
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by 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 5

  • 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://druttle.ru/wix?keyword=defend+new+orleans PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4466411/normal_5fe6ebdac9555.pdfIn PDF document text
    • https://cdn.sqhk.co/vopovaroxamo/LIR0ijc/88636171871.pdfIn PDF document text
    • https://cdn.sqhk.co/mugolino/gc3A4ji/medasuzol.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxomawelej/t8gjchg/79426757195.pdfIn PDF document text
    • https://cdn.sqhk.co/zezoxomop/bodhcYq/karugisimugikulupe.pdfIn PDF document text
    • https://cdn.sqhk.co/dosazuleg/ifiad5r/44212116560.pdfIn PDF document text
    • http://magazok.top/oracle_certification_sql_fundamentalsgigdl.pdfIn PDF document text
    • https://cdn.sqhk.co/lebudawojafi/qSRgeNk/fangamer_undertale_collector_s_edition.pdfIn PDF document text
    • http://winfreeiphone.xyz/how_to_set_up_adidas_sports_watchoving.pdfIn PDF document text
    • http://counterman.ru/52760749796c767c.pdfIn PDF document text
    • https://cdn.sqhk.co/dasadogiso/heuGijl/natakawusigizofedunog.pdfIn PDF document text
    • https://cdn.sqhk.co/nosamese/r0LsQhc/league_of_stickman_2_sword_demon.pdfIn PDF document text
    • https://cdn.sqhk.co/kupejabel/ijCRjaJ/pukulonigeto.pdfIn PDF document text
    • https://cdn.sqhk.co/tidilotofuka/xjgxkif/wawanesa_insurance_contact_information.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375095/normal_60476fa25fa30.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_bc13832d1ae342ccb191a13533fef717.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/39ae09d1-9d77-49c7-832e-4a2f6ff88c60/convict_conditioning_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81e9ac23-3ff3-4cf6-8471-f947f61f6b65/33630168952.pdfIn PDF document text
    • https://cb71deac-5427-4a11-aec2-6feec017c243.filesusr.com/ugd/4cd983_32fed583a80d45c783e285fe9deecab4.pdf?index=trueIn PDF document text
    • https://93dbb2ad-f1e8-4c6c-adfd-2ef134399473.filesusr.com/ugd/df4650_c8688816e596481988fb5787c5aa1aa4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc9d84bd-422a-4f36-9837-6344f8ed109e/can_german_citizens_work_in_usa.pdfIn PDF document text
    • https://33edd578-4186-4695-89f3-f56a5a23fc53.filesusr.com/ugd/f17c08_e5060cf1ed594b00ac5250e581307d3e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/638bb465-f16d-4110-9514-fa5ca395e9b5/how_to_log_into_chrome.pdfIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_42bcceb2f7684bfc9ac926a634394d32.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_off0001091d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091D 4992 bytes
SHA-256: 705cd435ee76954d8c42ce90f6a7b99a0881667220b1b237d79e3ea179ee6436
font_01_sfnt_off00011a42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A42 11324 bytes
SHA-256: 1af55c16df43c7ae644d7447a2f6b51af6cd8835e179c810b21840718cdab1c6