Malicious PDF — malware analysis report

Static analysis result for SHA-256 b49a8633b0efb811…

MALICIOUS

PDF

73.5 KB Created: 2021-02-26 16:41:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ce1ed793205f0cefbd0f99576024ab06 SHA-1: 82eed9af7b1f6f591b60ebaa116cb93ec0c4c572 SHA-256: b49a8633b0efb81126b0e945efff8ef983c8434008f67fa2586ac8bafc4373bf
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, and it contains a large number of external links, many of which point to PDF files. The heuristic PDF_SEO_LINK_FARM indicates a link farm, suggesting the PDF is used to drive traffic to other sites. The presence of embedded URLs further supports this, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://midufefew.ru/aws?utm_term=multiplication+grid+worksheet+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4378393/normal_5fff6a0743de9.pdfIn PDF document text
    • https://geguxawuxereko.weebly.com/uploads/1/3/1/3/131379712/8206919.pdfIn PDF document text
    • https://poxapoxidofex.weebly.com/uploads/1/3/4/0/134016688/2053176.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389823/normal_60067ec441693.pdfIn PDF document text
    • http://zenododuro.iblogger.org/38821971698.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414353/normal_5fff05589393f.pdfIn PDF document text
    • http://bimoriz.getenjoyment.net/dobukowivezovugisuzekoka.pdfIn PDF document text
    • http://dokojusekorukuf.iblogger.org/hpu_m._ed_date_sheet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486994/normal_6004ee1fd5aa3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458428/normal_5fe6719dc3571.pdfIn PDF document text
    • https://fenitejum.weebly.com/uploads/1/3/2/3/132302819/9119345.pdfIn PDF document text
    • http://gakukuketisalum.scienceontheweb.net/16256387680.pdfIn PDF document text
    • https://kovorugoza.weebly.com/uploads/1/3/1/3/131383314/4906143.pdfIn PDF document text
    • http://pigigozoruda.mypressonline.com/compare_and_contrast_essay_examples_8th_grade.pdfIn PDF document text
    • https://lepekogiba.weebly.com/uploads/1/3/1/6/131637498/15f39.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367927/normal_5fed38cebb144.pdfIn PDF document text
    • http://lufatomitonad.22web.org/java_6_without_oracle_account.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vawerudarasikow.myartsonline.com/matematica_financiera_ejercicios_de_interes_simple_resueltos.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_off0000e15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15B 5580 bytes
SHA-256: 227f03bce98ba2b47e659bb7d1e499f2c48e932da0fe5ae14e5d2a8e93943fa1
font_01_sfnt_off0000f470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF470 10704 bytes
SHA-256: bb848ecac5c6f0dda41ea70a210f25061538ded394396660bd2e3e4e9adf1b41

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