Malicious PDF — malware analysis report

Static analysis result for SHA-256 9290c568cfaa4868…

MALICIOUS

PDF

78.9 KB Created: 2021-04-09 23:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8229b3e8d3db78c666613de36eba0eb2 SHA-1: 75941241bb30bebaa19a4c901e95d6922a7b7710 SHA-256: 9290c568cfaa4868a916fb58efe0dc4bfc22b030e884cec6556f7294c9facefd
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous external links, with one prominent link pointing to 'https://pelibifir.ru/strik?utm_term=ge+toaster+oven+replacement+parts', suggesting a phishing or content-luring attempt. The presence of many external links, including a 'link farm', indicates a potential effort to drive traffic to malicious sites. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic strongly suggest an intent to redirect users to potentially harmful content.

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/strik?utm_term=ge+toaster+oven+replacement+parts
    • https://cdn.sqhk.co/saboxiwago/Rjcjiif/bloc_de_notas_apk_full_gratis.pdf
    • https://cdn.sqhk.co/zogobadakedu/ghdDjeb/pocket_tanks_mod_game_download.pdf
    • http://digitalmicroteter.xyz/315988420617n7kl.pdf
    • http://atomlinux.com/tevar_songs_download_mymp3songhc4it.pdf
    • http://grizhoff.ru/excelsior_orthopedics_physical_therapy_orchard_parkrya8z.pdf
    • https://cdn.sqhk.co/punipopi/jfhfjeq/98226375150.pdf
    • https://cdn.sqhk.co/kolusugego/dxzOQRT/chicken_green_goddess_salad.pdf
    • http://creditactive.info/dymo_labelwriter_4xl_labels_for_saledc55n.pdf
    • http://dnepr24.info/rosotoludadito0o5l8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tobito/el_desafio_del_amor_dia_11.pdf
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_46052a29180e4040a755046d5493624a.pdf?index=true
    • https://s3.amazonaws.com/fuvidokibet/67983408774.pdf
    • https://0f3c41ac-de96-4ba7-a517-026d7435d592.filesusr.com/ugd/8631de_0ae6600d030f4fadbea52f2d764aab40.pdf?index=true
    • https://s3.amazonaws.com/futamo/pit_and_the_pendulum_1991.pdf
    • https://ebed6276-6372-4ddf-adad-9a0fa504b99f.filesusr.com/ugd/805d2a_b31222ddcf634386b386a46239834dbf.pdf?index=true
    • https://s3.amazonaws.com/xijalovelokolep/vinokumevona.pdf
    • https://46b09160-81f9-4cb3-9cca-f7b5b0c0229e.filesusr.com/ugd/179cc6_b69eb16d5a1847ce848721529467db9e.pdf?index=true
    • https://s3.amazonaws.com/neviwove/mugalamuvatizexesubelona.pdf
    • https://s3.amazonaws.com/posufij/how_much_corn_does_1_acre_yield.pdf
    • https://f1801c53-b3f5-4b94-a9b3-4bb8eb376a66.filesusr.com/ugd/af633f_5475b212a634424e8f97d635e2689ff9.pdf?index=true
    • https://s3.amazonaws.com/xesigeze/4100999045.pdf
    • https://3568c1c9-c281-4b9a-9ea9-d5d291e0176b.filesusr.com/ugd/e5d8db_a109bbe106f44decb546419d3a8eea15.pdf?index=true
    • https://68a74d12-89ac-4a94-b826-09ad332a30bf.filesusr.com/ugd/1a0392_126943725aca406caf4f69f3d2b28b6d.pdf?index=true
    • https://s3.amazonaws.com/fikuvine/new_speed_queen_dryer_not_drying_well.pdf
    • https://b7af6bb9-01eb-4839-ab56-764651de4344.filesusr.com/ugd/2486b5_14a23f797ffd46c19ad94d5b6eb1c324.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f776.bin
225ac8cec3ff041daeffd02aeb1b52b2d77dc27cd44f46dcd038687aa5dca90f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF776 5172 bytes
font_01_sfnt_off00010902.bin
4fe8de547d8c1a1ff0d2c586775b7e9fc9430fd1a243f43bd0527482cb4491fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10902 10840 bytes

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