Malicious PDF — malware analysis report

Static analysis result for SHA-256 26d5180f3c36c9ec…

MALICIOUS

PDF

73.6 KB Created: 2021-03-22 21:35:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8e718eb70acb4476d7e0cd624af6b3be SHA-1: 5bc5051edfae6927dbc86d2b5a6af0c40cad1269 SHA-256: 26d5180f3c36c9ecde4b2293d4a3f44bf9a59235101628abfb3c8acb9c1dd34e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/123?utm_term=year+3%252F+4+spelling+worksheets PDF link annotation
    • http://bowuvudofi.scienceontheweb.net/watatosesomevuvape.pdfIn PDF document text
    • https://kaxamutibe.weebly.com/uploads/1/3/5/3/135348628/retaruzaf-meguxapodepomiv-sebawolibasi.pdfIn PDF document text
    • http://jilet1.club/63079657846l2duu.pdfIn PDF document text
    • http://smartcreditcheck.info/what_time_does_the_forex_market_open_in_california54c4o.pdfIn PDF document text
    • https://jezelide.weebly.com/uploads/1/3/0/8/130874318/0079b13c.pdfIn PDF document text
    • http://opencabinets.xyz/20990604820c19i4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/11203599626.pdfIn PDF document text
    • http://pusapovewazigu.onlinewebshop.net/english_translation_book_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/43714243307.pdfIn PDF document text
    • https://6eed613e-cbae-405e-b458-9655ef9033f8.filesusr.com/ugd/e4f6f0_fd5deba727b74a28acef61e8b8533b1f.pdf?index=trueIn PDF document text
    • http://fazaburifug.myartsonline.com/95783429424.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/nice_guidelines_type_2_diabetes_diagnosis.pdfIn PDF document text
    • https://87deab66-c645-46c6-955a-dbc2758d34a6.filesusr.com/ugd/302fc9_6d677eef68694ac5b309c93a30247c5d.pdf?index=trueIn PDF document text
    • http://naxesabefadufu.atwebpages.com/72838164131.pdfIn PDF document text
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_3225e08c81c04bb486b77c9c6dae142a.pdf?index=trueIn PDF document text
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_bcf0e721871e4fbb900e2b29c042aad5.pdf?index=trueIn PDF document text
    • http://nomamazuzut.atwebpages.com/forex_candlestick_patterns.pdfIn PDF document text
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_d35346855e5c4a92bfff1deeb10cd142.pdf?index=trueIn PDF document text
    • https://ba789de2-c385-43ee-b32d-a34c698d1993.filesusr.com/ugd/b7082a_8a6e0d0e0c564eb3aa0195dd58de49fa.pdf?index=trueIn PDF document text
    • https://44dd6259-7513-41c7-b2f1-b2b1fc385d2e.filesusr.com/ugd/63022f_021c28bc803c4583a5f0a9d98636485c.pdf?index=trueIn PDF document text
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_e4bc3ffa083f443597338204d2dd2714.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10D 5488 bytes
SHA-256: 781dfb86558e344a55a285691849f7c709f2f3cbaba31c8885f1786b956d85ba
font_01_sfnt_off0000f3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DC 10916 bytes
SHA-256: 21099bd7fb4ee34ce993638f5ca3b84a89793cdc4d46092a9e6b40812e8905ba