Malicious PDF — malware analysis report

Static analysis result for SHA-256 503d35af0f977dba…

MALICIOUS

PDF

68.0 KB Created: 2021-02-20 23:31:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 533678b2f0baf90de49aa47f4c8d7530 SHA-1: 11a0ce502d935a77250029dfaf70e85ad825b6d4 SHA-256: 503d35af0f977dba948cdf18ee70ca4aab50d8792033ee0232be463f62bbd519
162 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including a critical finding for a PDF redirector link to a known malicious domain. The ML classifier also strongly flagged the PDF. Although no scripts were explicitly extracted, the presence of a malicious redirector URL and the 'SE_DOWNLOAD_BUTTON' heuristic suggest the document's purpose is to trick the user into downloading a secondary payload, likely for phishing or malware distribution.

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.
  • 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://crophysi.ru/wix?keyword=sharecash+survey+killer+download In PDF document text
    • https://static.s123-cdn-static.com/uploads/4476757/normal_5fc6b03adcb2d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501660/normal_6008de6fcdeac.pdfIn PDF document text
    • http://ryursew.space/cryptarithmetic_multiplication_questions_and_answersqgmv2.pdfIn PDF document text
    • http://feedbacrnz.space/barriers_to_physical_activity8quag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368781/normal_6002625500751.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462038/normal_5ff6370537b65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420025/normal_5fd619c37ce7c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379960/normal_6003220a8b464.pdfIn PDF document text
    • http://hh666o.site/vigifituzikazugewuxumuxemd6dij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380395/normal_5fd76fe25aab8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470532/normal_5fe32d88ac10e.pdfIn PDF document text
    • https://cdn.sqhk.co/romekeka/jibhbig/large_cardboard_sheets_for_sale_near_me.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530712/normal_600507c3e2d3a.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/zolerazowubow/shuten_douji_onmyoji_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/65223980294.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_off0000cd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5E 5448 bytes
SHA-256: 2f03d885eadb74df6f67db2fdf6050da23beb12ec7b77432eec819275dc63dce
font_01_sfnt_off0000dff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF6 10352 bytes
SHA-256: 10f8089d7872e8f9fa1571407ac63d18d6ade2860160ac90e1f7d35453571295

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