Malicious PDF — malware analysis report

Static analysis result for SHA-256 48ebd19c09b1af6c…

MALICIOUS

PDF

75.3 KB Created: 2021-06-02 14:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 2e20220b6baed3f3de7c531867b274f7 SHA-1: 47d04f0c7ac5a69d05698daf4b3ffc6eb2526ee4 SHA-256: 48ebd19c09b1af6c631f11752e69bfd685a1d6f1abd9ee0dfd850be06e6519ba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, with a primary URL pointing to 'synerhu.ru' disguised as a guide for factory resetting an iPhone. This is a common lure for phishing or to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation or further payload delivery.

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://synerhu.ru/pbw?utm_term=how+to+factory+data+reset+an+iphone+6s+plus PDF link annotation
    • https://pepulumowuso.weebly.com/uploads/1/3/2/6/132681954/9240320.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461766/normal_603b48cc40ee1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366982/normal_5fdfde6e23508.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485591/normal_60535208c34b1.pdfIn PDF document text
    • https://nizuwutino.weebly.com/uploads/1/3/1/4/131482859/58c3a616c9a005.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4370286/normal_60afe4e60903e.pdfIn PDF document text
    • https://luriwopowilexat.weebly.com/uploads/1/3/4/3/134338936/korowuri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450730/normal_603f399a5dd47.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368467/normal_6001c5f197ef5.pdfIn PDF document text
    • https://tunogurepuxi.weebly.com/uploads/1/3/6/0/136054619/kerazevonobe_vusilumonitanek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lokiboz.pbworks.com/f/como_hacer_un_burro_con_una_caja_de_huevo.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/f/xakopevisimokagab.pdfIn PDF document text
    • http://katafuzum.pbworks.com/w/file/fetch/144486336/99518435800.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b648e6d3-a77f-4c0e-90ee-a8f0089becea/mercruiser_5.7_efi_reviews.pdfIn PDF document text
    • http://luwapoveduvi.pbworks.com/f/bare_knuckle_fighting_championship_salary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33fe393e-9094-4581-b161-9b00f4aad637/tascam_388_weight.pdfIn PDF document text
    • http://litorabi.pbworks.com/w/file/fetch/144484539/postfix_to_infix_converter_online.pdfIn PDF document text
    • http://xalomuzavege.pbworks.com/w/file/fetch/144458184/fasigu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e75bf5e7-a0d4-42f6-953b-14ec61294e98/cute_baby_girl_images_for_whatsapp_dp_download_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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE834 5552 bytes
SHA-256: d1ee41302d9c1add072c94c9755e4681ce357f6806db3a8dcd350f3ef3120382
font_01_sfnt_off0000fb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2F 10920 bytes
SHA-256: 7a13d0fc443ff72d4dc33e9c95312dd785de176a0646de90510de996bb900bb3

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