Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec8d2c0648d54535…

MALICIOUS

PDF

92.3 KB Created: 2021-04-19 02:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 649deb748eda41920a4256a8db363fae SHA-1: 94163322bf2c4a611665fe88625ee925e02c0183 SHA-256: ec8d2c0648d54535ad8770df6904459253435f905cc4cd680c5714b015cdb8c2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://soxebez.ru/strik?utm_term=the+mystery+of+capital+review PDF link annotation
    • https://cdn.sqhk.co/begokaxawip/it3aMig/independent_auditor_s_report_example.pdfIn PDF document text
    • http://dupaleb.22web.org/50482442200.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495040/normal_5fcfb0ae60af6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369327/normal_5fff4580df6c6.pdfIn PDF document text
    • https://cdn.sqhk.co/falunibesedo/ha7tDhf/calculus_made_easy_silvanus_phillips_thompson.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411717/normal_5fcfb221cada2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458144/normal_6023972d17f3c.pdfIn PDF document text
    • https://cdn.sqhk.co/xafiguzi/iijkpjp/lucifer_tv_series_hd_wallpapers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459796/normal_5fca5e4b405c6.pdfIn PDF document text
    • https://cdn.sqhk.co/pixafosabow/fgeCVD1/ruraro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448341/normal_605a59a4ee140.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478141/normal_5ffca851e43d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393759/normal_5fde9922037d8.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/8igrjPb/sandwich_maker_recipes_without_bread.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2791e1c6-719d-47aa-bdc5-1556df251b63.filesusr.com/ugd/7757c5_84a07a31bc4c47ac979b550fc6acd36d.pdf?index=trueIn PDF document text
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_ddb295389f3e446fa5738f1fa5e22ea5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sewamos/raginukawamo.pdfIn PDF document text
    • https://f171294f-ed7a-4884-a773-1e826a512430.filesusr.com/ugd/20d861_e67b89bd579e44c487678e067eca4229.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xakusineba/garoxa.pdfIn PDF document text
    • http://vorokam.rf.gd/3439013546.pdfIn PDF document text
    • https://b913155d-2712-4fd4-bcc6-651970a8c456.filesusr.com/ugd/e39924_c0d495fb59cb46c49f3638d35dda3f91.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rimepusox/kitefefuwixibej.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/dante_purgatorio_canto_xiv.pdfIn PDF document text
    • http://nolawasewunut.epizy.com/nowarikusowixopuz.pdfIn PDF document text
    • https://b7c6a474-53ed-4139-af63-4b2f501ae0e7.filesusr.com/ugd/e87294_39454622cd494e2b90ef6fe372027f73.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/papuja/savuzexefetedowefopolad.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001165f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165F 5460 bytes
SHA-256: a43916228b4da0f274a47a2f0ec9752e339bd79bbd703306db447232e300cf93
font_01_sfnt_off000128e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E2 10912 bytes
SHA-256: 9fe613bdca462cd555698699c26e372325eec4ce489d013c89c11870f81017a5
font_02_sfnt_off00014e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E25 16060 bytes
SHA-256: 4ef9506ee11a349461550e6b437e3786686b598308a87786035880d16624999d