Malicious PDF — malware analysis report

Static analysis result for SHA-256 d59a57e81c3589a3…

MALICIOUS

PDF

79.5 KB Created: 2020-12-31 13:40:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8c685a7f4bd978fa70086562493902ca SHA-1: 6f4a6d749e6ffcaf4800d404a7bd33a6db9be6e6 SHA-256: d59a57e81c3589a3487c6d9dacf35a0751ce0cf4241420854620f372a90eb3e5
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by multiple critical heuristics as malicious, including a redirector link and a link farm. The ML classifier also strongly indicated maliciousness. The document contains numerous embedded URLs, with at least one pointing to known malicious redirector infrastructure, suggesting an attempt to lure users to harmful content or phishing sites. No scripts were extracted, but the sheer volume of links and the critical heuristic firings indicate a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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.
  • 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://traffmen.ru/wb?keyword=top%201000%20spelling%20bee%20words In PDF document text
    • https://tifedufuzitiji.weebly.com/uploads/1/3/4/3/134353288/kivobevazezev_mimawafo_bamiwunenupemuw.pdfIn PDF document text
    • https://kigefewapese.weebly.com/uploads/1/3/4/5/134528385/pajuvedorusiwof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474445/normal_5fd7d88953935.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380076/normal_5f9926d195652.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/nuxulikiwab/95106133379.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/android_auto_compatible_cars_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/dekokadi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c60ec02-ed4b-40cf-b953-14ffcb531b55/zaputefaxufatezujifemenok.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/automatismos_manuales_epilepsia.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/dovomovurarebivazub.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/botanist_leveling_guide_ff14_80.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_off0000ef00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF00 5000 bytes
SHA-256: ed5586404ecdfa37f56efe794d5f121b40eda8c5ace02e6408652326ad986a7a
font_01_sfnt_off0001000a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000A 10312 bytes
SHA-256: 4f3afb98dc5b4d1f1f60fb11f825cbe09c5a9a6704baecd610e9eee3fdb4e6a0
font_02_sfnt_off00012312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12312 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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