Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a22aa2aa003503…

MALICIOUS

PDF

69.6 KB Created: 2020-12-17 01:44:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 8028c3b56ba3a2e121a91644888d58a6 SHA-1: 1fda47182e7333d11d6dc66747aeb46b7706d394 SHA-256: 36a22aa2aa003503457a3a53fba2948b5e16a1e69db911c2a7fe30fa557f8eed
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://ggtraff.ru/strik?utm_term=end+of+year+math+projects In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375522/normal_5f926e80274f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379474/normal_5fa04bc183240.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369163/normal_5f8dfce493cb4.pdfIn PDF document text
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/9b14549441c9.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://s3.amazonaws.com/zeworibuzoza/pafakapuritusola.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/mystical_agriculture_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ed0be6e-21d0-41d9-bad7-396bbbb1da72/sekiro_jizo_statue.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f9067d1-345c-454a-98b9-41980eb9bba3/january_2017_algebra_2_regents_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/55844811698.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/bafajugexokizewilu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3b1d1e1-3823-46da-b00b-aa98d2e28e7d/2002_mazda_protege5_service_repair_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/zolajixezasibu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A3 5240 bytes
SHA-256: 52873503bb878ca09412a8a8515c67792b2c36b78704a278bf0f22d557f9c3ff
font_01_sfnt_off0000d95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95C 9996 bytes
SHA-256: bf1f30210f9a50c245e3e015f7d3f760bfffaffe34ce27f73d0804b0513b654d
font_02_sfnt_off0000fba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA0 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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