Malicious PDF — malware analysis report

Static analysis result for SHA-256 14c1535ce0741a93…

MALICIOUS

PDF

78.6 KB Created: 2020-11-25 16:14:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d99828fac8b2315b78871a23940d17c1 SHA-1: 93a14eeb418189c487bff3a69d813be69f141552 SHA-256: 14c1535ce0741a93978b77601d81cb368e037bce799a9e6e7cd8d7a5d3ea9e7d
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/aws?utm_term=delid+cpu+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368952/normal_5f87dd612fbe6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483589/normal_5fa7a419eae99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368506/normal_5f8b90445f166.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369311/normal_5fafd20826109.pdfIn PDF document text
    • https://mudobimug.weebly.com/uploads/1/3/4/8/134853100/rololeleterutunefiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470205/normal_5fb378df96fcc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366987/normal_5f890cb4a204d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376379/normal_5f94bf0283933.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365649/normal_5f9f80f00b8f2.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/624958c8-eacb-4349-8faa-c99190543d51/vlc_android_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81b24568-6626-4075-9882-dc226b0d09c2/tom_jerry_video_free_download_mp4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e869eabe-2ea0-4ecc-8ab8-f6df202e0f29/gizokaxadutigixakusobu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ac81c95-adb8-4f65-bc3f-ac5bc31b5198/58367001757.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38b259ae-a735-4941-a9eb-e9240ef94bbf/nafevum.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE197 4756 bytes
SHA-256: af138e3b4f987524072ae17e49f122ef1d23722b4952cd09c5b4ca1ff3ea95c5
font_01_sfnt_off0000f1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E2 11428 bytes
SHA-256: 6b7207217c97055fb47dc8b5aa72a4a354ac9c39840a9f11f69c54cae99483d0
font_02_sfnt_off000118fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FE 16084 bytes
SHA-256: f8a29ee99fa618751840f4bb470ac1c8deea637908770bd91c39adf1e18f92d0

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