Malicious PDF — malware analysis report

Static analysis result for SHA-256 93bb69bba87dc332…

MALICIOUS

PDF

75.8 KB Created: 2021-05-24 00:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ee65ee66d9c50849cdcb78e2a6680c61 SHA-1: 509e9155b20ed58c5697b4a1f2c679ce3c0155a5 SHA-256: 93bb69bba87dc332cb740abe5561318a602a4fb62d18d9c536a1dba3fe618f50
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a link farm, with at least one pointing to known malicious redirector infrastructure. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=rolling+stones+tongue+sweatshirt In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371553/normal_5fd64d0d87913.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479224/normal_6040b0c23682d.pdfIn PDF document text
    • https://dedaxetodopifo.weebly.com/uploads/1/3/0/9/130968947/8803945.pdfIn PDF document text
    • https://tokawokemiw.weebly.com/uploads/1/3/4/7/134730305/6740402.pdfIn PDF document text
    • https://fawitazekivaji.weebly.com/uploads/1/3/1/4/131454143/zojexarupus.pdfIn PDF document text
    • https://zedurobarudavur.weebly.com/uploads/1/3/4/0/134018347/835528.pdfIn PDF document text
    • https://mikakegurotitu.weebly.com/uploads/1/3/4/3/134309030/6051105.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421209/normal_601160be055e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379486/normal_601d5958d36b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378848/normal_602e3712af37a.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/satuja/angry_birds_google_chrome.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/12212663529.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/azureus_vuze_chip.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/39006348968.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b07ecb2d-ad54-4bf3-8aef-7782e8a1fe9a/2006_gmc_envoy_xl_denali_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2aca2cd-c075-408f-b169-b461dec8b4c1/murizenerowubimukezebe.pdfIn PDF document text
    • https://s3.amazonaws.com/girilifawuxi/combustion_analysis_worksheet_pogil_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/laptop_acer_aspire_one_windows_10_video_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/wakuzidi/68569637968.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/23751580546.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_off0000ea9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9D 5044 bytes
SHA-256: e11cb4d14daa5c81563314017c111f23b552ee65ada8ad5b6bf52e7f6490ba19
font_01_sfnt_off0000fbd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD5 11068 bytes
SHA-256: 3e252da8aacbc089c4a791f94d5b5503297d30856441dc6e100601abd3e6d984

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