Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a745346829463b2…

MALICIOUS

PDF

80.3 KB Created: 2021-05-01 03:42:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: eb687281ed878a0436b35914ad2e82ec SHA-1: 92f84b20f72dca9a95865ab026e4970243e52043 SHA-256: 5a745346829463b207b3ca24d9747e92d4d82bce9d32f139206906012fb100f2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/strik?utm_term=how+big+is+30+x+45+cm PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467612/normal_604029d350289.pdfIn PDF document text
    • http://makedctl.site/ge_universal_remote_7252_cl4_codes3b2vo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418973/normal_6014afbd2e745.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448746/normal_601d38ff687a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416154/normal_5fdc1ad590faf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404122/normal_600b8c7fd00c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371553/normal_604fb6dd7a57c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426408/normal_5fe09783020b9.pdfIn PDF document text
    • http://distornyup.site/leadership_bs_jeffrey_pfefferhc0c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403262/normal_600c10f3c45c3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_19f25fab25c641fdbecae52d54e218f9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/357fb6a5-6d5e-460f-be57-6f69f7f5ab73/cuisinart_bread_maker_cbk_110_vs_200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4c7a3fa-5383-4d99-8cc7-f6c44980ca31/el_desafio_del_amor_40_dias_pelicula_completa_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47b36242-4d28-46d2-8254-95bca48ce9f4/cuanto_es_7_5_gramos_en_cucharadas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f620f3a1-e186-4ae9-a87f-ced4dcd0ce80/the_man_in_the_gray_flannel_suit_trailer.pdfIn PDF document text
    • https://1e438cd7-6f3b-42ac-a97b-d13a75fa135b.filesusr.com/ugd/0c268c_11a0f85333ee4b93b83478c9688eb004.pdf?index=trueIn PDF document text
    • https://50aad03f-9d2a-47e6-be13-abd12f321b17.filesusr.com/ugd/3fd638_12a012bc95f6474c930392596819b061.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF005 5044 bytes
SHA-256: eb0e1f1b3000a102664cc9cda9f08e8b8a0e0744593bf950bdd751cac7262e27
font_01_sfnt_off0001014d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014D 11136 bytes
SHA-256: ed57d62adfbc807a6eebe3969a5580239c1db338b6f2aab213aab764b595342b
font_02_sfnt_off00012679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12679 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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