Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a15d169d301acf…

MALICIOUS

PDF

124.7 KB Created: 2020-12-16 03:47:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c30bdd22d5efdc6015424c7cc26a62f1 SHA-1: 187acced8fcc629968dace139f5765ca2a404b6d SHA-256: 27a15d169d301acf86df04afd525eaf9a4956eb04e0904201ddf83a7154d21c2
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to a known malicious redirector, which is likely used to deliver a phishing or malware payload. The document body, though heavily obfuscated, contains heuristic indicators of urgency lures, further supporting a phishing or social engineering attack pattern.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cctraff.ru/aws?utm_term=hellp+syndrome+guidelines+rcog In PDF document text
    • https://cdn-cms.f-static.net/uploads/4419198/normal_5fa0c6980901a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368989/normal_5fa61357e0dcd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407994/normal_5faef4960d366.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421048/normal_5fb7e79e790a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366029/normal_5f922e1963cd4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473892/normal_5fc44dda853b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421339/normal_5fd6808ae94b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450636/normal_5fa978f1c05f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379618/normal_5fa861588c7ec.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/kavitokolezub/25038402779.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5d373e9fc3622d543b091/t/5fcf96db64290b1c3ddd9c17/1607440091443/5151718774.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/xuxitisujosi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc14b3cc89e1c4b8fc11549/t/5fc88962f97c193540f2d05b/1606977893222/instant_drag_racing.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/22142125561.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/buhler_sortex_a_manual.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_off0001a743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A743 5244 bytes
SHA-256: 4deced2f6d25d65561c34ff96418454fa90b68d09f16608f5de956375d304932
font_01_sfnt_off0001b90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B90D 13976 bytes
SHA-256: d54c4a304320dcd5d244765e2a946c9caed11d08d1a3468de9da3b8354ea9ecb

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