Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a5722ef1984302…

MALICIOUS

PDF

77.1 KB Created: 2021-02-01 02:56:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 6d94ee336d063f2cff0b6ee7542dea44 SHA-1: 95ba30ab420a6173bb073ccbde8713cde731665b SHA-256: 41a5722ef198430228449dadbb1d917a0ba0a1920b702fabdf778295ee95a33a
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or redirection to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of urgency and invoice lures, combined with the embedded URLs, points to a phishing or scam campaign designed to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://druttle.ru/123?utm_term=city+of+lakewood+wa+building+department PDF link annotation
    • http://dimax.website/jinexuz9d8z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419205/normal_5fd11dc873a7f.pdfIn PDF document text
    • http://7lessons.space/42908358561n92cx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388426/normal_5fd7decb8c265.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369317/normal_5fc930d635319.pdfIn PDF document text
    • http://tonagruz.ru/37179840866nb1ul.pdfIn PDF document text
    • http://freefire-gifts.com/sliegh_ride_sheet_musicjydfm.pdfIn PDF document text
    • http://everydays.space/chemical_principles_7th_edition1ib6w.pdfIn PDF document text
    • http://kukushpa.fun/dobakevewezuvubikol1vsft.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424011/normal_600f2ddb8e509.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/tigovatolis/nekozozozupevub.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/certificate_of_employment_sample_letter.pdfIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/45197501789.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_off0000ed23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED23 5484 bytes
SHA-256: 1c9473628109cdfbaa2efbc3df545bb2cb65a6b25ab3ddfc81c68fd618b88079
font_01_sfnt_off0000ffd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD3 11544 bytes
SHA-256: 405c5660b1132ac857874ad53cceccdb79f8a2b4b7195bdbcdc5cb1b3f629e80

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