Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc19ee809a518c8d…

MALICIOUS

PDF

67.1 KB Created: 2020-12-17 14:51:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9df56fa73a8e3f794d796970831cb5df SHA-1: d3145d452095b78f6430b76c5b32b3e044fbbec9 SHA-256: cc19ee809a518c8dac301b8b2649700c6d88045b2de5c8108ac0bddcae669327
214 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack.

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://traffmen.ru/strik?utm_term=government+mineral+springs+weather In PDF document text
    • https://cdn-cms.f-static.net/uploads/4388824/normal_5faf141b76817.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385612/normal_5f8db5c9e137d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365560/normal_5f8945d4ef507.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408324/normal_5fa62de86b601.pdfIn PDF document text
    • https://lififamofupuge.weebly.com/uploads/1/3/4/3/134317858/6900879.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488560/normal_5fb84afb10ff8.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/fejatepudopito/3245522095.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/fikibusilukud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09df3906-5d14-4905-841b-b83424811b24/gatopebowonovopi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50eb80e7-ca74-4a4a-8a81-0f6bea27e609/30686863491.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/utorrent_apk_free_download_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/57747105235.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fa75654-b80b-4d63-bc0c-2fbea61f4887/93732089101.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_off0000c989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC989 5416 bytes
SHA-256: c8099db499d255c57796a1ab699b2391b9925b4b73179ce542b0f75bc89f869b
font_01_sfnt_off0000dbdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDD 10492 bytes
SHA-256: 3f19c3c7524300c87e5903edf77620e6fe1aa83dd5eb833f7a1b7b85c7e2f637

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