Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa490f208e2e3b47…

MALICIOUS

PDF

70.5 KB Created: 2021-04-03 11:32:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ffe4069dbec554152cd5dca8ffb1ca21 SHA-1: 9eeda42f86cf92084e4e040e8bd9e0ad4cb523fc SHA-256: aa490f208e2e3b470f90ff2ec564d12be7119f64cbd0e76f08f5068579059d7e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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 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.
  • 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://zajinet.ru/123?utm_term=sculpture+evaluation+sheet+ks2 PDF link annotation
    • http://jaxagogilexet.sportsontheweb.net/spoken_english_book_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d787a32c-196b-4e99-9c98-3ae3c28023f9.filesusr.com/ugd/05b469_23d9f66c913545db93653788084eef5e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/travel_brochure_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0727cff-1835-4ac4-af0e-044dcb6dae68/62254027320.pdfIn PDF document text
    • https://4edd92ed-4e96-4c3d-a837-a16c7246ae9e.filesusr.com/ugd/7c3149_d98e6725e92f438a90751ca5fb332d2f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d34daeb-d243-4e1c-a6dd-41852051f820/9.9_scatter_plot_worksheets_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/born_to_endless_night.pdfIn PDF document text
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_180df19c0ef941cfb19768b64d9b4bb6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/46394952171.pdfIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/guardian_petsafe_wireless_fence_manual.pdfIn PDF document text
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_899170e4ca3c45a085b744c1f09c6d8a.pdf?index=trueIn PDF document text
    • http://xuxerutiwuv.onlinewebshop.net/34135568479.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/incident_response_playbook_template.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/cbse_chemistry_notes_for_class_11.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/case_files_series_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/how_to_make_spur_gears_in_inventor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bfe0187-5887-456c-82b2-7fcd68edc016/ember_in_the_ashes_book_4_release_date.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/petty_cacioppo_1986_communication_and_persuasion.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/only_king_forever_chords_b.pdfIn PDF document text
    • https://28f2c00a-638b-45ec-8848-4d649cb6aba9.filesusr.com/ugd/946f28_60eba3765374429b952ee50c72621053.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_off0000d67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67E 5380 bytes
SHA-256: e8fb71d1f42b1d8d5c6c70545abab0bd2bb46575491f02b67d5860fe73440ebb
font_01_sfnt_off0000e8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CA 10436 bytes
SHA-256: 4edbb0389f586fc41983002ca313aeeb707a056a5cad035736fe8b7bb29dd821

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