Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf65d4429245506…

MALICIOUS

PDF

77.9 KB Created: 2021-04-05 21:23:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f6cea649ffde9929a76bf3e419bcf41b SHA-1: 9d3ac266c6166b6d572b06f483112bb65e9dad73 SHA-256: 3cf65d442924550616c14b6d05bdf6ba6c79163b9e052e65d0a6dcfe77588bfc
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 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/123?utm_term=all+odia+song PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4474220/normal_6066a44b7b681.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495402/normal_5ff8755c496b2.pdfIn PDF document text
    • http://jonebukusopovet.mygamesonline.org/communicative_approach_in_teaching_grammar.pdfIn PDF document text
    • http://youtube-subscribes.com/urdu_words_used_by_police3ck41.pdfIn PDF document text
    • http://rbqjkwklnd.xyz/difference_folk_and_pop_cultureuok95.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487197/normal_600046038c249.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447915/normal_5fef44a2b1dcc.pdfIn PDF document text
    • http://vehicleusains.com/jebikaravozojokuw5zj0.pdfIn PDF document text
    • http://tonilakifak.mypressonline.com/74830736878.pdfIn PDF document text
    • http://creditscoretracking.info/weritidelup2covs.pdfIn PDF document text
    • http://ruvujagefeko.mygamesonline.org/47172487594.pdfIn PDF document text
    • http://giveaway2020.info/gidiginudifb0xpa.pdfIn PDF document text
    • http://pumba.fun/alternative_to_google_keyboard_androidyawo1.pdfIn PDF document text
    • http://bizifemodefi.mygamesonline.org/paulk_workbench_ii_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484383/normal_600da3d8ee851.pdfIn PDF document text
    • http://palitra-cveta.ru/multiplication_worksheets_for_grade_2_with_picturesin456.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd2d8ca9-7214-4aea-9087-8f39236006f9/wuferotot.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/86690034715.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30d031ca-5a68-456a-ac0e-93a8547d954d/75421645168.pdfIn PDF document text
    • https://s3.amazonaws.com/zowibatev/89203008446.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/maya_angelou_poems_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5bf8e2c-515c-4736-a00a-16c88cd962a8/fitonavaw.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_off0000f381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF381 4884 bytes
SHA-256: 7fb087650f40cb9e381f9a82df906d269332ea73c5520b36dde1728f207cf356
font_01_sfnt_off00010431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10431 11404 bytes
SHA-256: 2cd3ac80b5e144d5d7e5f98836170b98dc7db737dcec9bb726a17894cfff2fd4

Open this report in the interactive analyzer, or submit your own file for analysis.