Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff3ec3e656eb9911…

MALICIOUS

PDF

79.3 KB Created: 2021-03-13 23:51:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5ef89baf1a4df11cd5c460eac8436518 SHA-1: 12ac7cfeaa002cd1da319d0dca89ae105af2a756 SHA-256: ff3ec3e656eb9911ef5f28fe8eea47f7ac03c616b4095b84f9df640cbe32d910
126 Risk Score

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://dafemum.ru/123?utm_term=analog+devices+adc+datasheet PDF link annotation
    • http://leririv.sportsontheweb.net/mibosiserapep.pdfIn PDF document text
    • http://opensoda.pro/how_to_clean_range_hood_filters_in_dishwasherzk5xd.pdfIn PDF document text
    • http://gloslides.com/is_bulletproof_diet_good_for_you3fjh7.pdfIn PDF document text
    • https://bejixetixozivi.weebly.com/uploads/1/3/4/4/134499198/b958bbb881b.pdfIn PDF document text
    • https://nokavapeselodes.weebly.com/uploads/1/3/4/6/134638024/nevun-perategofuxix-latarulugugarul.pdfIn PDF document text
    • http://hookup754.fun/zojaxufinebubazwjckw.pdfIn PDF document text
    • http://crispyset.online/ample_guitar_taylor0uc9v.pdfIn PDF document text
    • http://1xbet-football.fun/hssc_clerk_answer_key_2019_22_september0218x.pdfIn PDF document text
    • https://pogefaduvo.weebly.com/uploads/1/3/5/3/135391099/genat-wusedepuv-likuw-pativofej.pdfIn PDF document text
    • http://realwockyc.info/211216310571lbt7.pdfIn PDF document text
    • https://wojewifonutej.weebly.com/uploads/1/3/4/8/134883442/2176935.pdfIn PDF document text
    • http://national-verifyteam.com/5711859560bozl8.pdfIn PDF document text
    • http://myfirstsite.xyz/ya_no_eres_pan_y_vino_letra_karaokeegxn6.pdfIn PDF document text
    • http://pokupka.space/ddp_yoga_free_streammrtj3.pdfIn PDF document text
    • http://mp4.design/tuvatosifojigojibirkwn6.pdfIn PDF document text
    • https://zumikifekov.weebly.com/uploads/1/3/0/8/130813997/2622401.pdfIn PDF document text
    • http://xuwuvewisin.mypressonline.com/pivezema.pdfIn PDF document text
    • http://nuverlites.online/house_rent_receipt_templatesnx6uv.pdfIn PDF document text
    • http://site-shop.xyz/what_are_the_steps_in_writing_a_balanced_chemical_equationaemhe.pdfIn PDF document text
    • http://alcexpress3.xyz/3908527749yz5iw.pdfIn PDF document text
    • https://niridugur.weebly.com/uploads/1/3/5/2/135296669/7187d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B6 5156 bytes
SHA-256: 9acd3456aa1c669590a1383c62807d9a541225cf42f671ad30aa4ea20a12c4e2
font_01_sfnt_off00010a44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A44 11028 bytes
SHA-256: 75f380916f0672e86d948c7d020145bee0f1b1e1b666b02cb8c1b7ec31cd6a21

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