Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5c398345d289d5e…

MALICIOUS

PDF

80.1 KB Created: 2021-03-09 22:45:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 57d6aa63ca9fc9e706ba224b79feaa8f SHA-1: 9d55ba0874eb3f48dbee808afb8605b7ac0d98b1 SHA-256: b5c398345d289d5e922ec498cdc016437fe91c5c380da4e0d2ac98be5322c19e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://baarspo.ru/wix?keyword=periodic+table+blocks+in+minecraft PDF link annotation
    • http://jnatural.space/vector_quantity_has_both_magnitude_directionz90hk.pdfIn PDF document text
    • http://support-copyrighthelpservice-about.com/lorepz7fol.pdfIn PDF document text
    • http://wulutano.mywebcommunity.org/6629425836.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://8ab1a2d5-e5b1-44c5-a28c-e09959565f0d.filesusr.com/ugd/eb712c_eb159072f5eb4d439f94d43fd61c7523.pdf?index=trueIn PDF document text
    • https://c46c713f-5e69-4c64-aad4-d86f29440f76.filesusr.com/ugd/957c7b_951f93a245044e8c969b7abe236710fb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/38168323702.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e66a21e-dc30-4535-974a-c1dae5be5825/21176576844.pdfIn PDF document text
    • https://054d5c26-596f-48a3-87a7-0fc79031e5db.filesusr.com/ugd/599026_011f433aff72402d852f1f2112a036e8.pdf?index=trueIn PDF document text
    • https://ffcd7f67-9b43-45c2-8e44-b15cca9583b8.filesusr.com/ugd/48bf55_4d4e1532a49f48b987946c9c2f2f7642.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/popilo/kexiximuzuk.pdfIn PDF document text
    • http://keregimuw.onlinewebshop.net/what_happens_in_vampire_diaries_season_8_last_episode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de820fd5-08e1-4f77-aa10-76ec969d9ae5/lemoruparexegexifa.pdfIn PDF document text
    • https://s3.amazonaws.com/kimone/36706797932.pdfIn PDF document text
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_7c5c38e6918041d6a95e5c288f751b82.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d8d626c-5fe6-489a-9720-114a3c342d6b/would_you_rather_best_questions_dirty.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7efa88be-575a-4172-a33b-3c2aba023747/fuwonulokozufedinofazekag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6b29f80-c0fc-4912-9811-e18a1a889ae2/rccg_sunday_school_teachers_manual_10th_january_2021.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF58 5160 bytes
SHA-256: 05e1600263ed64963b5c7d6f0fcd03e8a8b296acf57e66b1ae527243b9bf3bc7
font_01_sfnt_off000100bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BD 10608 bytes
SHA-256: fcc8a8fa641e9e460a4e21dea72e2de3d9a7fb2051ba02320cde706f02721380
font_02_sfnt_off000124f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F3 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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