Malicious PDF — malware analysis report

Static analysis result for SHA-256 545e4f3a818803fe…

MALICIOUS

PDF

73.8 KB Created: 2020-12-16 22:33:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 630b3aac8a1d6032101e4cae2f6f9e04 SHA-1: 0009284361756029261365277ada552c16ec0b70 SHA-256: 545e4f3a818803fed2fcb18b8391c1d39758ef59f36aa9ee4bfc675dd407612a
222 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojanized document. It contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/123?utm_term=jc+penney+closing+stores+in+florida'. The document body, though heavily obfuscated, contains text fragments related to store closings, likely serving as a lure. The presence of a link farm further suggests malicious intent.

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
  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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
  • 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/123?utm_term=jc+penney+closing+stores+in+florida In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369491/normal_5fc1482226e3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387718/normal_5f9016350d9dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373778/normal_5f9866c7f36fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402711/normal_5fc4ccc232f5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484156/normal_5fd3dcd44860c.pdfIn PDF document text
    • https://xukopalobupekon.weebly.com/uploads/1/3/4/7/134730613/tapafogel-gisimuvizi-zetilon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fce0ced5895864d8953d1e9/t/5fd6e3acb1c3f31c7a951df3/1607918509161/android_gps_coordinates.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4d73311f6a419849eeda5/t/5fd12ecc5e03a8313dc2aecf/1607544524979/letufutodiloju.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc298b02bbd7406581167d1/t/5fc684bd5147b1480415334a/1606845633250/76242163719.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/334081b2-4b51-433c-88f9-9008eada99b5/giguzukukikirome.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2923b7848ba205d233c3f/t/5fcc44b2d235d37878b9b30c/1607222450889/98007400608.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc360b6bda9c57a97cdfd08/t/5fcb302336758319a54ef684/1607151652000/sodumobenetodebujoxeguzez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21b7d907-92f3-4f1d-ba93-04dec422972c/acentos_teclado_lenovo.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_off0000e335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE335 5416 bytes
SHA-256: f55d50f581f6f20e8a2d8a30d1ca69003380613c5ace2e8b9d8568e5f2620885
font_01_sfnt_off0000f5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B8 10896 bytes
SHA-256: ecd9579e58e3f4c37bd49c5467fa07575a4fef2068fca2b79a38f52bdbef3580

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