Malicious PDF — malware analysis report

Static analysis result for SHA-256 93437918a92a7bb3…

MALICIOUS

PDF

71.6 KB Created: 2020-11-09 22:34:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 38ccf624f2bfd6984b7e984c3822886d SHA-1: 146e970ea4b96285b2f5ec5010443dbcd47cb259 SHA-256: 93437918a92a7bb3ba8f2c72fce59abc2eec38363e8aa6bf893a7b95f160304c
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 0.9998

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://cctraff.ru/aws?keyword=continental+mathematics+league In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387815/normal_5f95c19ae6dab.pdfIn PDF document text
    • https://zoveponezewuda.weebly.com/uploads/1/3/0/7/130738822/pawotexoxaramitase.pdfIn PDF document text
    • https://gimelasu.weebly.com/uploads/1/3/4/5/134513778/e30f4ad0f0d17c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407057/normal_5f95be325f656.pdfIn PDF document text
    • https://xukujeferok.weebly.com/uploads/1/3/4/4/134435440/rafinugofe-fosunodanatosu-maxazigumuxezu-xuguzogu.pdfIn PDF document text
    • https://bilewobadazape.weebly.com/uploads/1/3/2/6/132695578/fejuge.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/597e9efc-4c46-4afc-a4b8-d8fd33cba79f/wudop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36ab6cb0-1bd7-40d8-9b8d-6cfcb09fd45c/tera_hone_laga_hoon_full_song_mp3_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/wituvofujavogawav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65da01aa-821b-4732-acf8-4c13d76a7fb3/famixizuseva.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/como_inserir_assinatura_digitalizada_no.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f9e3a31-fb7c-45f7-bcd8-bd1de73eaad4/tozowesefidowerelu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8feea4c8-8e97-4437-ba19-4cc4b99481be/first_edition_yugioh_card_price_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/cartoon_strike_unblocked_google_sites.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_off0000cd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5E 5024 bytes
SHA-256: 3cd9fbcfb45af4224018b6eebab0f6088e55095aea725e22243978c891836be6
font_01_sfnt_off0000de47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE47 11040 bytes
SHA-256: 38559dbe3942dd5be394f50efcd1c75e4901718771645f2eb513b7a3c056670c
font_02_sfnt_off0001038c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038C 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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