Malicious PDF — malware analysis report

Static analysis result for SHA-256 8393d447638741d8…

MALICIOUS

PDF

87.6 KB Created: 2021-06-01 20:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 5e98b3ed2cc2fa030d805bfa67af2eb7 SHA-1: 8b69f637674e83d15a9951912bce411947909586 SHA-256: 8393d447638741d8747d9769190a14d124597bacb475f814e8b4731666338739
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://lozipotod.ru/123?utm_term=active+listening+skills+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378425/normal_60148bb34a378.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472216/normal_5ff4059c4014d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368950/normal_60432f224c64c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382614/normal_5fe3220b77b25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454808/normal_6047b3f38d5a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489440/normal_6048f4f4b3e7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446398/normal_602a807f4b555.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383131/normal_603b94a23a27b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480753/normal_5fec969d98072.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380219/normal_6028c16b481d9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nusuwoxub.pbworks.com/w/file/fetch/144422454/zarobirijebogojepomejedid.pdfIn PDF document text
    • http://memofemovo.pbworks.com/w/file/fetch/144439857/95083884723.pdfIn PDF document text
    • http://ziduzobif.pbworks.com/w/file/fetch/144456009/beloxunovinogenitopig.pdfIn PDF document text
    • http://mibegenav.pbworks.com/w/file/fetch/144462933/congruent_shapes_worksheets_grade_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bb13467-90d5-4985-891c-f657a8dcc113/45650484651.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ebf45f8-8b91-4799-ad67-0e1ad1ca8def/hmt_mechatronics_book.pdfIn PDF document text
    • http://mifimoruzuwo.pbworks.com/w/file/fetch/144466395/ditobobumotesu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/708c9080-946b-472c-9b8b-c0ad71240512/bose_wave_music_system_repair_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

Related samples 7

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11940 5056 bytes
SHA-256: 5090158e8b297e046f0a96dbc048b4dc5bcc1c2bfe225aed0800e630bf077654
font_01_sfnt_off00012a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A88 11324 bytes
SHA-256: e73a9149b55f1d781ccdf0cfa201e0505021a6185d2fa1568e951f70ff8cd1af

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