Malicious PDF — malware analysis report

Static analysis result for SHA-256 b13c138c584f73d8…

MALICIOUS

PDF

65.6 KB Created: 2021-01-04 20:49:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: eb18876387e741756883175df62df7b9 SHA-1: abc267ed090227834227fb7719367ef357d32b1a SHA-256: b13c138c584f73d8a07e3f310aa13c7c97328df603c65dff4b5d453c3462d952
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://gettraff.ru/aws?utm_term=ie11+pdf+acrobat+reader+dc'. This indicates the document is designed to redirect users to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious, supporting the phishing and redirection intent. No scripts were extracted, but the presence of malicious URLs and the document's nature suggest it's part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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://gettraff.ru/aws?utm_term=ie11+pdf+acrobat+reader+dc In PDF document text
    • https://cdn.sqhk.co/taxosavasesa/Awhchi1/66877234496.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370068/normal_5fc8b3b864228.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384167/normal_5f8d911013cac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368504/normal_5fdf96a348eb5.pdfIn PDF document text
    • https://febafowizozijuz.weebly.com/uploads/1/3/4/8/134860945/a32aecd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366666/normal_5f907e235f571.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369802/normal_5fa330304be8a.pdfIn PDF document text
    • https://nedotumawu.weebly.com/uploads/1/3/4/6/134626041/sarivogo_zutaxerirudagew.pdfIn PDF document text
    • https://cdn.sqhk.co/letojeka/Jhhgggi/rumese.pdfIn PDF document text
    • https://cdn.sqhk.co/xusovatovu/eDEhb4l/30333065123.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://s3.amazonaws.com/jemazejodep/fagarunemepa.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/adobe_creative_cloud_apps.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_off0000ba46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA46 4704 bytes
SHA-256: 5abfcaabba21265f5478560701c88bbf7462f91569207168a22aef141663e9f5
font_01_sfnt_off0000ca48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA48 9824 bytes
SHA-256: 4dc8f72d793d1452104bec32501f70b987b1b52d65dafc284f9f09e6ed019cd1
font_02_sfnt_off0000ebd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD7 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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