Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6344170ef5dad81…

MALICIOUS

PDF

75.2 KB Created: 2021-03-19 17:45:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 78febe7ae2ea6189c7d8963ca3b861b2 SHA-1: 922e16a9943520045124fbf49d9984a6fbdaa03c SHA-256: c6344170ef5dad811fd41325bc4b732e52a83fa32ddb7626de5c4449b2298019
214 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 alert for linking to known malicious redirector infrastructure. The PDF contains a large number of external links, many of which point to potentially malicious or SEO-farmed content, suggesting an attempt to redirect users to harmful sites. While no scripts were explicitly extracted, the PDF structure and the nature of the links strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • 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://yafferge.ru/award?keyword=breve+historia+del+%25C3%25A1frica+subsahariana+pdf In PDF document text
    • http://vas-rem.ru/zewefapesezerefe7twrn.pdfIn PDF document text
    • http://the-glow.ru/534775077gbavn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368504/normal_601170d0cef5d.pdfIn PDF document text
    • https://foxevavudutis.weebly.com/uploads/1/3/4/3/134380199/sewivum.pdfIn PDF document text
    • https://zomereke.weebly.com/uploads/1/3/5/3/135397468/zenifonotu_turugari_kibofonaz_filixexar.pdfIn PDF document text
    • http://organicsss.space/bipawigubh3ps.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426966/normal_601c96a3c7038.pdfIn PDF document text
    • http://francobusiness.com/28604047272sl3tm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393508/normal_604f36409fa7b.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/bugutaj/cardinals_injury_report_nfl.pdfIn PDF document text
    • https://s3.amazonaws.com/dazawojob/capresso_coffee_machine_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b652680-1e52-4ad5-8bbc-5ee25ed18fda/siporatizebaguto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d934488b-f607-494a-81b9-c7b6fcb14eef/what_should_a_career_summary_include.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/lewamefisilusowibe.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/wozip.pdfIn PDF document text
    • https://s3.amazonaws.com/legobegutulo/ranuwiwoj.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/nupegaladibojo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6ec82eb-9e85-4f34-b768-3aa44b08b21e/solution_definition_chemistry_ks3.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_off0000e291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE291 5728 bytes
SHA-256: 2f4cf9cf289377ffbfcef3f09e31ab2117c5b37292c47c189a3cf2b738c92c45
font_01_sfnt_off0000f57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57D 12756 bytes
SHA-256: f762ac311877520105f5623dea234251c0df4284d11ce72d32b56024ed1d686d

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