Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c52f8822658ca54…

MALICIOUS

PDF

73.8 KB Created: 2021-03-04 01:27:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: fdd7c1480ea3856326c7092b6ab9bf5d SHA-1: be6590d19aa5e8099954f966330ec7dab2f574ee SHA-256: 7c52f8822658ca5421e23e90dc5fb79b0bfee40dd6501e66f73ae1afb27afa06
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely used to host malicious content or redirect to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to a worksheet, aligning with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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
  • 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://crophysi.ru/wix?keyword=cold+war+around+the+world+worksheet+answers PDF link annotation
    • http://scarcebook.com/redezoduwagekagubelijoe4yy.pdfIn PDF document text
    • http://avtoshkola-region26.ru/408877420059tw6o.pdfIn PDF document text
    • http://jofufunobek.sportsontheweb.net/majarawunajojasijomigej.pdfIn PDF document text
    • http://whysmall.space/zubomiropafapudokepasi1pb2w.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380383/normal_5fc7cee1b4186.pdfIn PDF document text
    • http://barajofa.mywebcommunity.org/59925813263.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420250/normal_6028f912a3840.pdfIn PDF document text
    • http://tajuliwelofiti.medianewsonline.com/subject_pronouns_worksheet_for_grade_1.pdfIn PDF document text
    • http://kunujunekedi.mygamesonline.org/washington_state_university_ranking.pdfIn PDF document text
    • http://hd-cam-mirror-up1.club/temaponeromumugi5r9tx.pdfIn PDF document text
    • http://masajsalonunuz.com/fixikepetazowizafodaytgm6.pdfIn PDF document text
    • http://kakafeg.scienceontheweb.net/61091158252.pdfIn PDF document text
    • http://ital-tess.space/98133447962nia24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485699/normal_5fd5f9a83be6f.pdfIn PDF document text
    • http://sixesijilolun.mywebcommunity.org/does_alexa_work_with_roku_express.pdfIn PDF document text
    • http://afracheat2.xyz/337459738964hh70.pdfIn PDF document text
    • http://itmax.info/13561046996g553r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xomapagovujux.atwebpages.com/evan-moor_free_workbooks.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_off0000e342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE342 4972 bytes
SHA-256: e414d0ef05c48632b9159da9c694789fbb94020ed325788b0e8dfc977caffe00
font_01_sfnt_off0000f42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42D 11060 bytes
SHA-256: 47159a1f5d43de817fe66e0a937a9b2aa1d4af6db55470bdb16e976912397c7f

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