Malicious PDF — malware analysis report

Static analysis result for SHA-256 5277e4ddf1b1ead4…

MALICIOUS

PDF

107.1 KB Created: 2021-02-08 04:49:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 506510ca163289182645ca224699d001 SHA-1: 550c96659ad96232d63852afe29818c9d5d8d004 SHA-256: 5277e4ddf1b1ead453d758842d9bdfecc16ebc2393ad04a003d309db83effa32
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, identified by the 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier further support its malicious nature, flagging it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a likely attempt to lead users to malicious content or phishing pages.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://jacksth.ru/123?utm_term=frog+and+toad+stories+youtube PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459057/normal_6003b2b4b468d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488141/normal_5fe1b3a18cb79.pdfIn PDF document text
    • https://jedifubebevaze.weebly.com/uploads/1/3/4/8/134873515/bd017bc64cc5b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454054/normal_5fd1ea4a383a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408992/normal_60122c823748b.pdfIn PDF document text
    • https://muxiduxipa.weebly.com/uploads/1/3/5/3/135319221/baferifafam-kevikidesoxalik-ririrukoramira-sefunuxim.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/zafibimutadoti/gujubuvigalovipafi.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/php_and_android_developer_jobs_in_indore.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/totosepar.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/rufopezewadanakezav.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/11246957686.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/measure_perimeter_of_2d_shapes_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/bernina_830_instruction_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/45818006262.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/clear_acrylic_sheet_sizes.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/22724681780.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/real_steel_world_robot_boxing_hacked_apk.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_off0001634a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1634A 5156 bytes
SHA-256: 6caead06930baa997197b91fc9344fe7b3b23f5bc4387a8622a6f6158a9d2d17
font_01_sfnt_off000174eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174EB 13732 bytes
SHA-256: 7b7f2f2eec3e0be1eda1af2ddd05a7a6d1c0fba806a2fc1ee481bed718529fe8

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