Malicious PDF — malware analysis report

Static analysis result for SHA-256 24009e0c595c1e21…

MALICIOUS

PDF

75.7 KB Created: 2021-03-25 10:56:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 64e7382a2e7fadfc28680e3d9d5936f0 SHA-1: db8b4f0b6c9a7f4dfcbf7b9718fbf6ffd324de78 SHA-256: 24009e0c595c1e21827ebc6de5932cdf86caa15a811a5a800595f8304b0409f4
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 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/wix?keyword=new+fhx-al+apk+download PDF link annotation
    • http://namsinc.info/numaxobizijekiserewl63fq.pdfIn PDF document text
    • https://cdn.sqhk.co/totudavomud/eEDHjhh/didiwafe.pdfIn PDF document text
    • http://forovasax.medianewsonline.com/internal_audit_manager_job_description.pdfIn PDF document text
    • https://cdn.sqhk.co/tokafumotebi/diggeje/15324996548.pdfIn PDF document text
    • http://jomikifu.medianewsonline.com/axis_direct_brokerage.pdfIn PDF document text
    • https://rizofuruw.weebly.com/uploads/1/3/0/8/130873790/af92e08fe5e1e.pdfIn PDF document text
    • https://cdn.sqhk.co/fopikudapom/eifhagc/40153706992.pdfIn PDF document text
    • http://goproonly.com/nuby_flexi_straw_cup_boots3lvsh.pdfIn PDF document text
    • http://merovew.xyz/simplicity_7117_repair_manual4h6dk.pdfIn PDF document text
    • https://gibuximo.weebly.com/uploads/1/3/4/6/134665594/4673318.pdfIn PDF document text
    • http://tanolugulutewu.medianewsonline.com/88954916694.pdfIn PDF document text
    • http://shopyou.online/fluid_mechanics_rc_hibbelerg4syo.pdfIn PDF document text
    • https://batusuxejodasav.weebly.com/uploads/1/3/1/8/131857782/a44884.pdfIn PDF document text
    • http://funseeds.site/gamapo0dw23.pdfIn PDF document text
    • http://gowanenutik.mypressonline.com/plan_de_campagne_publicitaire.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d33b8dfc-9792-4d26-9d81-613d0bd32a71.filesusr.com/ugd/d34367_b505c2ed0173446c977d11b8d2fdd835.pdf?index=trueIn PDF document text
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_9bfab4af99ec494e8aa1c77cbdf6adec.pdf?index=trueIn PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_a241dfbe60a54af4ab94ea06d0eee3b6.pdf?index=trueIn PDF document text
    • https://6200e599-3f2f-4e3e-ab45-e6977ed7e777.filesusr.com/ugd/f8de3e_c7b5d5796f1a43d3b88199451661c574.pdf?index=trueIn PDF document text
    • https://c7f0abc7-d23b-482d-bd16-0771495bb668.filesusr.com/ugd/bb13a2_7a0f22482667477aa1a7837f386943b1.pdf?index=trueIn PDF document text
    • https://2e5cbe44-7de3-4e3f-b94c-8a8567814465.filesusr.com/ugd/f96b02_829c8eae433b470fa3b8279e38012962.pdf?index=trueIn PDF document text
    • http://bujekotu.atwebpages.com/26459542565.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_off0000eb0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0F 5080 bytes
SHA-256: e5412598c7f3ea83ff818a04e6dc4dffd9413d8a209c4f27141da82cc1ecffb8
font_01_sfnt_off0000fc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7E 10748 bytes
SHA-256: da2e817922131ce0dd76fcfd266875584afd2352fdfccd4edbfbc09a4c421792