Malicious PDF — malware analysis report

Static analysis result for SHA-256 c24c6b3a041657c8…

MALICIOUS

PDF

80.9 KB Created: 2021-03-31 00:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 76f47306ac6febddbac4695da20585ba SHA-1: c45e74a416622c6bd5184780d368c64edc6bd816 SHA-256: c24c6b3a041657c80858cdcdc3668793575f2ac1ad9d99179b53f855626a5f7e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://leonvi.ru/wix?keyword=hero+wars+cheats+4.2.0 PDF link annotation
    • https://susawodaf.weebly.com/uploads/1/3/2/8/132814942/jipaf_gufitalepuziv_rixekosik.pdfIn PDF document text
    • http://gtomishebs.xyz/27913547676c3nfc.pdfIn PDF document text
    • http://gramnews.xyz/kagakirinovdb8eq.pdfIn PDF document text
    • http://digtalcaliper09.xyz/the_greatest_salesman_in_the_world_summary_in_hindi4aslb.pdfIn PDF document text
    • http://kvyovk.xyz/9264295637jcnid.pdfIn PDF document text
    • https://pefekebemapufug.weebly.com/uploads/1/3/4/3/134370705/divotuz.pdfIn PDF document text
    • https://gunarolapikomi.weebly.com/uploads/1/3/4/4/134442839/4354735.pdfIn PDF document text
    • https://dutebosolet.weebly.com/uploads/1/3/0/9/130969562/68830073e.pdfIn PDF document text
    • http://siteznakomstv69.space/how_to_replace_water_filter_samsung_refrigerator42iu0.pdfIn PDF document text
    • https://disovipogazita.weebly.com/uploads/1/3/1/3/131398104/1613746.pdfIn PDF document text
    • https://suzeziji.weebly.com/uploads/1/3/0/7/130739492/4191516.pdfIn PDF document text
    • https://nikigetevakawu.weebly.com/uploads/1/3/1/4/131413362/bejuzad-fagapuk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/51006c3c-4000-443d-aecd-6fe837f7a9d6/37404935794.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5534bece-e169-4f0b-ae94-2b7c74b8efad/20689921505.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13254265-67dc-4f30-8659-1456db05c03e/79709246328.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3d2a815-93f5-48f1-94e1-c397a8261a72/descargar_traductor_de_ingles_a_espaol_gratis_para_celular_samsung.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8953b9ad-9f9d-44fc-b7d5-597d79acd26b/38626570070.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d33d600c-f5bd-4417-90e7-d7d4ee089353/monstrous_pizza_phone_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38c33681-d692-45c4-ab74-a85221455da8/how_to_use_compound_sentences.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a9bd15b-1d17-465a-bed7-14d1659a1679/34712945866.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbf9bc46-86aa-4183-845c-00f101b7173a/drizzt_dourdens_guide_to_the_underdark.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_off0000fca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA0 5304 bytes
SHA-256: a5134dada395dd289b3b840618c413c1b615e2cd15e80322d73e7a6fccb74d20
font_01_sfnt_off00010ec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC2 11716 bytes
SHA-256: 2a44a3850bbb0437364ceb4e3afc30db83d071e43bf673a976aec761bb8ace43