Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aafd485f0c71f5c…

MALICIOUS

PDF

95.4 KB Created: 2021-04-03 17:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 725433fa05496c81827c2aad06be77e9 SHA-1: 532176095adfaed9db2e9a3255afb29eb9116646 SHA-256: 1aafd485f0c71f5c9c1152a9b7543dda6e3f3fc6ee2d8f6ff5551415fa6497af
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 0.9997

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://maypoin.ru/123?utm_term=bricks+intensive+reading+2+answer+key+pdf PDF link annotation
    • https://sivipamekan.weebly.com/uploads/1/3/2/6/132682587/kijawokuwujewude.pdfIn PDF document text
    • http://leree6.club/45471619218zph2x.pdfIn PDF document text
    • http://ampinternational.org/regesuposuloqzop.pdfIn PDF document text
    • http://ridunculus.com/how_do_you_reset_a_ducane_furnacez0la1.pdfIn PDF document text
    • http://busforpay.online/newsletter_templates_freeq5zf6.pdfIn PDF document text
    • https://cdn.sqhk.co/zeburozupax/dggKyod/85319969080.pdfIn PDF document text
    • http://semengergel.ru/diagnostico_comunitario_y_sus_elementos7w3kr.pdfIn PDF document text
    • http://azorocheat6.xyz/you_are_precious_to_god_scripture6zwri.pdfIn PDF document text
    • https://wusuritod.weebly.com/uploads/1/3/0/7/130739885/kibunen.pdfIn PDF document text
    • http://my-favshopc.online/76073627497nvzpq.pdfIn PDF document text
    • https://cdn.sqhk.co/banuluwopote/iiShgXB/world_cup_qualifiers_usa_tv.pdfIn PDF document text
    • https://cdn.sqhk.co/sarunasol/dlhbhiq/surumemot.pdfIn PDF document text
    • https://sajaxelofokaxus.weebly.com/uploads/1/3/0/7/130776185/68e7b.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/xirixepo/mists_of_avalon_plot.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/badri_tamil_audio_songs_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2367a581-846c-4448-8a31-e7d022019cc1/10515047972.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/ubee_router_login_spectrum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1d32cb3-d2e4-4466-91ca-6b810e2ccb94/lorikuzizegunebonesudesum.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_off00011d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D35 6544 bytes
SHA-256: f1b7c2d78c482b227602b3a6022d709fa3b441a4c4f581a1d2a6e69ab90b740b
font_01_sfnt_off000132f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F2 5788 bytes
SHA-256: 422acca3acf729611fb9285dc86261b45938ff230bbd1c17df4ef56e8e9a7b8d
font_02_sfnt_off000146e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146E6 11540 bytes
SHA-256: b4937aecbb39727ff22a4b940345d8b58890bfdc53d71aff00359c70b58cf7b9

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