Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0ceade01f17d199…

MALICIOUS

PDF

74.5 KB Created: 2020-12-17 01:06:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d0f3a23b8b002e51948d50612ac28c54 SHA-1: 71180d2667f6bee9fae898509e5849170ebb897e SHA-256: f0ceade01f17d199193ed9709196722d49a33b9812d8fddb9abaa577fa9b2cfd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to suspicious domains, indicating a link farm or phishing attempt. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF_SEO_LINK_FARM heuristic specifically identifying a mass of external links. The document body, though heavily obfuscated, contains text related to 'Heats of reaction lab 33 answers', suggesting a lure to disguise the malicious intent.

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
  • 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://trafffe.ru/123?utm_term=heats+of+reaction+lab+33+answers PDF link annotation
    • https://sanuvexugivi.weebly.com/uploads/1/3/1/6/131606490/gewuwudu_gewaniva_bekukonika.pdfIn PDF document text
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/662f88ddd5cf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf6c6e61e25426e1314078/1606380655043/95563548545.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4d2a4df132613bbd6bae0/t/5fcf2b8a69d6d06d553aeaa8/1607412619873/marionette_wallpaper_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fifuto/53719510235.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5a3e840f1034a5cc929d3/t/5fd60ac30f11661d4c220e80/1607862979720/queen_s_guard_uniform_history.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/limekuzobesowelan.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/the_sims_3_free_download_apk.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc529855e8e827d42a99b3c/t/5fcff6f17b0a801071f8c374/1607464690551/tap_smiths_cheats.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd2303c5a03c71785cad98/1606230789545/tangent_lines_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/30571991838.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/10472045537.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/minimize_file_size_online.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_off0000e570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE570 5232 bytes
SHA-256: a19ca254ccfc377c74aef6a924ed8c67769cb865345f703b77dc97d7e4a73d3b
font_01_sfnt_off0000f75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75C 11352 bytes
SHA-256: 124e0a119858bccbcee1861965cfcad0b0b147e5770f11b3e92d3ec1569c1311

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