Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bdebfb2e2ffbd74…

MALICIOUS

PDF

70.1 KB Created: 2020-11-29 20:05:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 805a279103c0f4c4133ec9526668a483 SHA-1: d814dbb64bb6134fa56afa46cafd304b1e28956e SHA-256: 9bdebfb2e2ffbd7422bf07c9d7e97419621cf200610a8c3737daecb322ec7657
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 0.9998

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://gettraff.ru/strik?utm_term=cpm+algebra+1+chapter+4+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4412158/normal_5f94197a39a57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409113/normal_5f989baa23aec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374181/normal_5fc24d307eb43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487432/normal_5fb86af35a46f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381740/normal_5fad26b915933.pdfIn PDF document text
    • https://bupigesow.weebly.com/uploads/1/3/4/3/134360728/1462769.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://uploads.strikinglycdn.com/files/d2112644-1012-4ae7-9f0b-50479fe77dee/cell_phone_wallet_purse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/beb5b156-be8b-4235-85d1-058f59575431/razebu.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/35285904978.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e054beee-22b1-4749-8da9-7d0be85efdf5/mid_manhattan_library.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/663d69db-5669-476e-aff8-c2a8dc856de2/84199485072.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/android_checkedtextview_in_listview_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc163804-1e11-41af-8585-303963f2d1d6/5575681398.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_off0000c20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC20A 5372 bytes
SHA-256: 9fe64b9964def2f0d78eb4048b3600b2a6f4020da7427c0d4c35e8cef2c1ab21
font_01_sfnt_off0000d43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43F 12108 bytes
SHA-256: 9a1b58ac9501b5749fd12ab61c80cb869ca14086e1ca19acb9dd259484189257
font_02_sfnt_off0000fd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD75 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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