Malicious PDF — malware analysis report

Static analysis result for SHA-256 793c1fc17f7f8ab3…

MALICIOUS

PDF

81.2 KB Created: 2021-03-02 04:45:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 40ebbd1d7cc75cadc29bf04050e0de8f SHA-1: 14f40d86c234a94d3df121b68987ed8fb5abaa81 SHA-256: 793c1fc17f7f8ab3318d1cca74e8fda29deaacd6cb7a08248cdeebd7a33218d5
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 0.9996

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://dugedepap.ru/strik?utm_term=traductor+espa%25C3%25B1ol+a+latin+antiguo+online PDF link annotation
    • https://cdn.sqhk.co/tefupudoma/LHjahjo/vintage_pinball_machine_ebay.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466175/normal_5fdc89b6acbe3.pdfIn PDF document text
    • https://cdn.sqhk.co/kokademesuz/ehgu80a/10242068142.pdfIn PDF document text
    • https://cdn.sqhk.co/xibumediw/VaJrDid/67122171189.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377371/normal_5fe05964bfc2b.pdfIn PDF document text
    • http://rivozuzeno.mywebcommunity.org/english_learning_books_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466367/normal_600a9e5c3f666.pdfIn PDF document text
    • https://cdn.sqhk.co/fogobewataja/ibgijig/24416196208.pdfIn PDF document text
    • http://xapizokawe.iblogger.org/droid4x_android_emulator_review.pdfIn PDF document text
    • http://wufelemu.22web.org/is_dunkin_donuts_peppermint_mocha_swirl_vegan.pdfIn PDF document text
    • http://vifezitenof.getenjoyment.net/ruzebimiwikej.pdfIn PDF document text
    • http://sidumila.iblogger.org/avatar_telugu_dubbed_movie_movierulz.pdfIn PDF document text
    • http://jopkapopka.online/raja_rani_sad_ringtones_download_teluguqwjis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488574/normal_602495e64f91c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vuruwabudakase.epizy.com/latest_aerobics_music_free.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E5 6740 bytes
SHA-256: 960be24e41903e2c9ee1a53646adac9b94dd6a5b6743d5e0f11d54c2ff8ab323
font_01_sfnt_off0000f2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B9 5400 bytes
SHA-256: 77550d59e67adc373fb5c14f4a07583066222e895ad4cd448776d5aa3baef329
font_02_sfnt_off000104db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DB 1852 bytes
SHA-256: a0007d79d67dcff13d53cd43fae07f32686197cceecd610c93d253f2b9616ab2
font_03_sfnt_off00010dee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEE 11948 bytes
SHA-256: 891121045a2c8500d3acd163c434b69ba4b26643a3e37361b591451abee0ff33

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