Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb648ff1c1f229fe…

MALICIOUS

PDF

87.5 KB Created: 2020-11-22 13:29:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 4c6bab7542a4759a2103776c03292699 SHA-1: d7af6d5ab293e5dd42a759774ea9fb5e91eb4759 SHA-256: cb648ff1c1f229fe6a2762b4e7c0229881be52f00c1ff224d8b6dd29921e9f68
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and heuristics indicate it contains a link farm pointing to known malicious redirector infrastructure. The embedded links likely serve to lure users to phishing sites or download further malware. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

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://gettraff.ru/123?utm_term=piazza+del+campidoglio+pronunciation In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366022/normal_5f96c634ee1b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368485/normal_5f8a67e39523b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377112/normal_5f986d9223cd3.pdfIn PDF document text
    • https://fategebedabeno.weebly.com/uploads/1/3/4/7/134718848/lanezo_xusuxuguwikati_raroviz.pdfIn PDF document text
    • https://nulivoji.weebly.com/uploads/1/3/4/3/134343303/6244095.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404116/normal_5fad830f1ac9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421474/normal_5f973d5c6cd48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413968/normal_5f96423b6d9e8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/63669dd6-3588-40b3-ac59-33ada5b8537e/maroli.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/lagifik.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/kahoot_app_download_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/cake_pops_rezept_silikonform.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_off00010a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1C 2888 bytes
SHA-256: 604725ebf9bf0d9ab2bcf42cb3b9eb1946ba017bf99d5c2e6531ff47cfbc4b7a
font_01_sfnt_off0001145f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145F 5264 bytes
SHA-256: 8d8553b862c391b7f5e81aeafa797d9a54061a52ef9d80b5908e438d48cf5312
font_02_sfnt_off0001263c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263C 13120 bytes
SHA-256: f5d786922baca13fdf67854085217bf381a7e62d78793ba4f1c9f9b18c46476f

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