Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0358224d78b545e…

MALICIOUS

PDF

62.2 KB Created: 2020-11-28 11:49:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c0aa8ba2b92ae9409d09bed58180a5fb SHA-1: 9895dd47c70ee6d0b4b0d2862c3f7ba8099ee1d1 SHA-256: c0358224d78b545edb68e3662cc3af130001f4c2683134fbadb35171b2dff053
222 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, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=holt+french+2+workbook+answers+chapter+1 In PDF document text
    • https://sowozulame.weebly.com/uploads/1/3/4/7/134733070/walal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377717/normal_5fbf16e9845f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500887/normal_5fbf7f86c8140.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/c80f4fe6-2590-4243-95f3-32be3d009ff9/bemamekonowenajixof.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/meiosis_reading_packet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/wetilivavavuga.pdfIn PDF document text
    • https://s3.amazonaws.com/tipakalif/53167981627.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/fefedugoruxetovu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/454c097b-ac79-4b4b-a400-f5199d5cd5fe/29289282268.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79686cc0-767c-487c-a086-69a3e3184eb1/kexezitaruvatatal.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/edward_said_orientalism_summary.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_off0000b470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB470 5544 bytes
SHA-256: 0bd3c7e342840dca2509606a01eca628a011f3ce33d3141886940416606b97e9
font_01_sfnt_off0000c75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75E 11240 bytes
SHA-256: c173b7b0d343f86d025f7983da4557a04d3fb04f85844630c4a7dc3863776c8f

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