Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb1889bd2a003fae…

MALICIOUS

PDF

83.2 KB Created: 2021-03-16 21:46:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e1e6f05d5eb0b7cb1e5ea9d17af804bb SHA-1: 1158b196cd4816f4f0aa6c8b568040484ba7161d SHA-256: bb1889bd2a003faeaeb199f62ec7378a80b086b4c2ad4a78f6ba4001755bc683
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://jacksth.ru/wix?keyword=coloring+leather+al+stohlman+pdf PDF link annotation
    • http://fejugutafilevin.scienceontheweb.net/67170047728.pdfIn PDF document text
    • http://lnstagram-helps-contact.com/how_to_become_an_iso_27001_certification_body2p3oy.pdfIn PDF document text
    • http://gukiduwonaxinef.getenjoyment.net/morepurplemorebetter_character_sheet.pdfIn PDF document text
    • http://onlinetyz.xyz/lidizozis22on4.pdfIn PDF document text
    • http://jotafitosixa.getenjoyment.net/legogofoxarewaxipoxetepib.pdfIn PDF document text
    • http://nowtorrentz.com/42251503233765za.pdfIn PDF document text
    • http://sberbank.link/excel_betinget_formatering_flere_cellerjepcm.pdfIn PDF document text
    • http://gojavodevagajuw.mygamesonline.org/the_beginning_of_everything_season_2_episode_1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/volum_av_sylinder_formel.pdfIn PDF document text
    • https://ebcfae26-b4e4-4f1a-a5b2-c5bdbddc1bdf.filesusr.com/ugd/259f90_dd05553079454341aab979c9fe5096a7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c264bad-7b7a-41bc-b999-dd1cc6d13b25/point_guard_dribbling_workout.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76c9e241-2bf0-41c4-9423-3142e283dd6e/funny_names_for_zoom_call.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d65bc32-5f8a-43d8-b955-52a52f351ead/wuralasokerexover.pdfIn PDF document text
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_38cb5d635ae9400dbfdfdd8aa2d61b11.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab330434-c3c3-4a29-a610-95736a4da958/16534759995.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/zezunirubasokagem.pdfIn PDF document text
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_43af0aeaf4534ffab0574eb856056c27.pdf?index=trueIn PDF document text
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_4c059c8fad3e4425909663ce6ed10819.pdf?index=trueIn PDF document text
    • https://09235f31-469a-4613-94fc-36d04c1f642a.filesusr.com/ugd/8b6407_682fc9d4d4ec40c68f4e4728ff10c954.pdf?index=trueIn PDF document text
    • https://fa0867c9-8cf0-46f9-bfae-aad8e49c21f3.filesusr.com/ugd/cdba2c_ca7bf85bacd64c10b8829c51c1ffd0a5.pdf?index=trueIn PDF document text
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_9ca37897c97e4f4b86adc3ec1955ffff.pdf?index=trueIn PDF document text
    • https://4a39c6c9-989b-4d11-b2d8-cc0becc7f193.filesusr.com/ugd/ef0078_23191e5a90664829bd3b7afb0970b02b.pdf?index=trueIn PDF document text
    • https://8dac4d01-2cd1-45d2-8b5f-6005f802adc9.filesusr.com/ugd/1f96ce_9b2516247ce94b598baa72b7da0a9721.pdf?index=trueIn PDF document text
    • https://0ccb9a81-bd3c-41bd-bc79-2352350f0e5e.filesusr.com/ugd/95ea6b_1388300c5e634851b1bbed711fcc6008.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/febopa/english_to_english_offline_dictionary_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/litar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d08a37f2-193e-49b9-937f-fe79bb4712d8/fixotaxawuw.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/sufedibetowivenin.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_off00010694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10694 5360 bytes
SHA-256: 19ea0debcaf52b9d5c3f8c8e19105e3b6979968c9a5eee6a978948d3dd1c6ee3
font_01_sfnt_off0001189e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189E 11176 bytes
SHA-256: 27c7fcf269e92ee46873c69ecfc92551834593691a008eeb8780043a4c088bda