Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b4b98b12455c81a…

MALICIOUS

PDF

73.4 KB Created: 2021-03-25 21:59:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: abcebd6094b48194c70621b61304557d SHA-1: 564727a0c73a684178c7fa59fff100603db82bb3 SHA-256: 2b4b98b12455c81aff408702beda42115cffa9d66f97440a658642969d293524
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a 'link farm' designed to generate SEO traffic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the presence of embedded URLs and the PDF structure suggest an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://xezojetit.ru/award?keyword=brochure+design+tips+pdf PDF link annotation
    • http://salonop.xyz/how_to_use_flash_chromewmm8t.pdfIn PDF document text
    • http://trixy-matrix.space/lawn_boy_mower_oil_to_gas_ratiomftxq.pdfIn PDF document text
    • http://eferevole.com/how_to_remember_the_sailors_creedqyygy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420597/normal_602a274627e08.pdfIn PDF document text
    • http://lessonsonline.site/kafazulazoris16q3t.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475727/normal_5fcb9bc20fb47.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/jixeremipet/jumbled_sentences_worksheets_for_class_4.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/fufarixagovaxuv.pdfIn PDF document text
    • http://xojakejib.epizy.com/disef.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/bernarr_macfadden_books.pdfIn PDF document text
    • https://a0d2adcf-75bd-42a9-a42a-c23e1c6e9e1a.filesusr.com/ugd/85c99c_a653cd1213a948cca8e3390086e763ef.pdf?index=trueIn PDF document text
    • http://debetofewozuri.epizy.com/cast_away_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/4425387296.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/61968793170.pdfIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_b3e368c19e9749748886c07f77addd51.pdf?index=trueIn PDF document text
    • http://wigelasipop.rf.gd/korukidusejeluxo.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_off0000e48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48C 5224 bytes
SHA-256: 2bea0710c740b53db33f289cda1291b282e06127f17141f4f22983f17301eb0f
font_01_sfnt_off0000f654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF654 10076 bytes
SHA-256: 6ba56916104538a8b0792a913d0bdb96a0481f6769aba1fe8b2db176ad9211c5

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