Malicious PDF — malware analysis report

Static analysis result for SHA-256 927b35f6076f2f71…

MALICIOUS

PDF

73.7 KB Created: 2021-04-24 10:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9b0a2a0364570b197096157925e88a5b SHA-1: b89a6fd99679efb31286843b7d39f0a80108599b SHA-256: 927b35f6076f2f712f3190ec3f869f0de84954cee1fb1188d4750188f18f63a9
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 0.9998

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://dafemum.ru/strik?utm_term=how+to+make+a+rocket+stove+out+of+cinder+blocks PDF link annotation
    • https://nusomosuguxapo.weebly.com/uploads/1/3/4/6/134693055/251c6.pdfIn PDF document text
    • http://flowerport.store/platinum_mathematics_grade_7_downloadsq3lt.pdfIn PDF document text
    • https://labelamujevodit.weebly.com/uploads/1/3/1/6/131606697/7e9c9d36923.pdfIn PDF document text
    • http://zutatowatipo.mywebcommunity.org/sword_art_online_episodes_order.pdfIn PDF document text
    • http://runojiponavu.22web.org/american_english_file_3_free_download.pdfIn PDF document text
    • http://faxusupovetek.sportsontheweb.net/essential_idioms_in_english_download.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/dhgibe3/68370709295.pdfIn PDF document text
    • http://prequester.online/kumafekuzebapasevukezuqmvkg.pdfIn PDF document text
    • https://sopowifumerage.weebly.com/uploads/1/3/4/3/134355846/2693005.pdfIn PDF document text
    • https://nosokubidudat.weebly.com/uploads/1/3/4/3/134321305/349805.pdfIn PDF document text
    • http://labiosdewonda.com/14145532029iuoob.pdfIn PDF document text
    • https://difodofixipa.weebly.com/uploads/1/3/0/8/130814112/8092042c041e20.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://najaxobefirag.epizy.com/zisetomujulifabatu.pdfIn PDF document text
    • http://dexizijisub.atwebpages.com/adverbios_de_lugar_ejercicios.pdfIn PDF document text
    • http://zugepoguj.onlinewebshop.net/independent_auditor_s_report_2020_format.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_off0000e2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DE 5484 bytes
SHA-256: 6a624558696b1384f2844086f91699c65348edf3f7f95ae40c6d964a8bdf72f3
font_01_sfnt_off0000f580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF580 10600 bytes
SHA-256: ff392c3660e74acb818cc68d85a48607d4343c813749d33999d820b9898c8a5f