Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c40d57beb323d3d…

MALICIOUS

PDF

82.8 KB Created: 2021-03-22 00:12:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 88a7fbfd08dbc49e89715c53912b0f5a SHA-1: 2f60578f017f152feb09a83f50283995909efb98 SHA-256: 0c40d57beb323d3d9f1f713df3bc53717c61357de4467c146e44c18ffe5c64f6
96 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 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 0.9992

Heuristics 4

  • 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://pelibifir.ru/123?utm_term=four+types+of+sentences+worksheets+pdf PDF link annotation
    • https://supenavasude.weebly.com/uploads/1/3/5/3/135397397/limidop.pdfIn PDF document text
    • http://hotsales-com.xyz/what_is_the_difference_between_the_enlightenment_and_the_great_awakeningmjl4q.pdfIn PDF document text
    • http://vorecan.fun/31110880824z6phf.pdfIn PDF document text
    • http://premium-cinema.com/kidde_kn-cosm-ib_recallk3lr0.pdfIn PDF document text
    • https://lilafigofuku.weebly.com/uploads/1/3/1/3/131398347/legatawutufup.pdfIn PDF document text
    • https://vurofagulomefu.weebly.com/uploads/1/3/1/4/131452840/721afaa6dff2620.pdfIn PDF document text
    • https://pibemalogodozod.weebly.com/uploads/1/3/2/6/132681910/raleluwor-jerorev-sixif-jevuzoxudi.pdfIn PDF document text
    • http://fapseo.ru/how_to_tell_if_ac_expansion_valve_is_bad77yld.pdfIn PDF document text
    • https://gixosakovi.weebly.com/uploads/1/3/4/6/134677645/1282363.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/xenavuxa/faxupudazizo.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/i_will_be_or_i_am_going_to_be.pdfIn PDF document text
    • https://fc06435f-e709-4c80-b59d-96fa470c1a13.filesusr.com/ugd/bdc04d_35fbf739f8804cbaaf038618a3053e6e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rebomedug/free_cursive_handwriting_worksheets_for_third_grade.pdfIn PDF document text
    • https://b81f28a7-a6cc-4df9-aebb-a76b708ee4b5.filesusr.com/ugd/df05b2_736cfb7f15d8476ab8f8c38b495d5965.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/28057184695.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d52512cc-8875-4e31-8673-216f22783dd7/how_to_buy_direct_listing_stock.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/vasuguparibiza.pdfIn PDF document text
    • https://235be7ff-9b22-41de-91df-7a9e5ced5199.filesusr.com/ugd/4fa465_016915a4aa734485ac34cad3413070df.pdf?index=trueIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_4ec96b3b3a044977af4d072c3c5483f9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/17e57fab-2395-4e2e-9d75-8509ba87993f/nubepewuzezabokizilalip.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/75228565355.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/madwoman_in_the_attic_jane_eyre.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/entry_level_computer_science_jobs_new_york_city.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_off00010487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10487 5216 bytes
SHA-256: 851c3879d2da07cd7cf99ebf515ef78f7d42f6c292700a94a79e913e021fe636
font_01_sfnt_off00011660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11660 11408 bytes
SHA-256: ae84eff2afa3462f1a13ad9acd463cb94f3be8a78e4b0ccd57e659c50f804ade

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