Malicious PDF — malware analysis report

Static analysis result for SHA-256 27cf3eb4f8399b6a…

MALICIOUS

PDF

77.8 KB Created: 2021-03-07 20:59:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 56e1e0952ea54397b1354e4275a566c8 SHA-1: 4f0e0a8914c0dc06d3ad3afe6e5bd2c85eb35cde SHA-256: 27cf3eb4f8399b6a960dabb4ddb865a06762f95ca3858b14b16b5e85b14b78a7
126 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that redirects to a link farm, ultimately pointing to a malicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains text related to search queries, suggesting a lure to a malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://midufefew.ru/strik?utm_term=who+are+the+three+most+famous+renaissance+artists PDF link annotation
    • http://return-0.com/download_song_thank_you_lord_for_you2udha.pdfIn PDF document text
    • http://bosemefawixuwov.mypressonline.com/world_map_printable_template.pdfIn PDF document text
    • http://pawomodom.medianewsonline.com/how_do_i_find_network_security_key_for_wifi.pdfIn PDF document text
    • http://klosheff.xyz/download_footrock_2_mod_apk_android_1l00ev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426415/normal_601ab7b57035d.pdfIn PDF document text
    • http://tuduvodakep.mypressonline.com/79978500274.pdfIn PDF document text
    • http://zefujixa.mywebcommunity.org/sepegujesuvotovowulimi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461485/normal_603335d4c61f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450628/normal_5fdc195fc1f70.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6ba7316d-b84b-4ccb-a32a-103c856d4013.filesusr.com/ugd/91f37e_cea79a67aa384b5d8bb83428c995d44b.pdf?index=trueIn PDF document text
    • https://ef733714-782c-48ea-8991-1bc0bf0c95f2.filesusr.com/ugd/ad2ade_ecf73b61d78b4c2c98fe0f74017cac40.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/lurogugexenena.pdfIn PDF document text
    • https://f459ab6e-ac57-43ce-b83a-1524846427e4.filesusr.com/ugd/938c70_b1b370a2ce534dd48b58bc8a85a4b467.pdf?index=trueIn PDF document text
    • http://pujumek.myartsonline.com/95085916923.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/zaror.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/mailmessage_attachment_c.pdfIn PDF document text
    • https://6d428a25-da86-44fa-8f13-5b0f09742281.filesusr.com/ugd/3649d2_3ecd5a45615b4b7793a3b4c28f9c7911.pdf?index=trueIn PDF document text
    • http://roveramo.atwebpages.com/the_couple_next_door_synopsis_and_spoilers.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_off0000f402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF402 5100 bytes
SHA-256: c93906f640f2979ffc926ff94d0b0a8bc4b9fd4f2443513f167e70c0437417de
font_01_sfnt_off0001053e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053E 10528 bytes
SHA-256: b69cdec662a6aba0768573e8b46c2085d72351411c38d440fdb4ab2caad71fc8

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